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[flat] /flæt/

adjective, flatter, flattest.
1.
horizontally level:
a flat roof.
2.
level, even, or without unevenness of surface, as land or tabletops.
3.
having a surface that is without marked projections or depressions:
a broad, flat face.
4.
lying horizontally and at full length, as a person; prostrate:
He was flat on the canvas after the knockdown.
5.
lying wholly on or against something:
The banner was flat against the wall.
6.
thrown down, laid low, or level with the ground, as fallen trees or buildings.
7.
having a generally level shape or appearance; not deep or thick:
a flat plate.
8.
(of the heel of a shoe) low and broad.
9.
spread out, as an unrolled map or the open hand.
10.
deflated; collapsed:
a flat tire.
11.
absolute, downright, or positive; without qualification:
a flat denial.
12.
without modification or variation:
a flat rate.
13.
Informal. lacking money; broke.
14.
without vitality or animation; lifeless; dull:
flat writing.
15.
having lost its flavor, sharpness, or life, as wine or food; stale.
16.
(of a beverage) having lost its effervescence.
17.
without flavor; not spiced:
flat cooking.
18.
prosaic, banal, or insipid:
a flat style.
19.
pointless, as a remark or joke.
20.
commercially inactive:
a flat day in the stock market.
21.
(of a painting) not having the illusion of volume or depth.
22.
(of a photograph or painting) lacking contrast or gradations of tone or color.
23.
(of paint) without gloss; not shiny; mat.
24.
not clear, sharp, or ringing, as sound or a voice.
25.
lacking resonance and variation in pitch; monotonous:
a flat delivery of the speech.
26.
Music.

27.
Grammar. derived without change in form, as English to brush from the noun brush and adverbs that do not add -ly to the adjective form as fast, cheap, and slow.
28.
Phonetics. lenis; voiced.
29.
Nautical.

30.
flat a, the a -sound (a) of glad, bat, or act.
noun
31.
something flat.
32.
a shoe, especially a woman’s shoe, with a flat heel or no heel.
33.
a flat surface, side, or part of anything:
He struck me with the flat of his hand.
34.
flat or level ground; a flat area:
salt flats.
35.
a marsh, shoal, or shallow.
36.
Music.

37.
Theater. a piece of scenery consisting of a wooden frame, usually rectangular, covered with lightweight board or fabric.
38.
a broad, thin book, chiefly for children:
a juvenile flat.
39.
Informal. a deflated automobile tire.
40.
(in postal use) a large flat package, as in a manila envelope, for mailing.
41.
Architecture. a flat roof or deck.
42.
Nautical.

43.
Shipbuilding.

44.
an iron or steel bar of rectangular cross section.
45.
Textiles. one of a series of laths covered with card clothing, used in conjunction with the cylinder in carding.
46.
Photography. one or more negatives or positives in position to be reproduced.
47.
Printing. a device for holding a negative or positive flat for reproduction by photoengraving.
48.
Horticulture. a shallow, lidless box or tray used for rooting seeds and cuttings and for growing young plants.
49.
a similar box used for shipping and selling fruits and vegetables.
50.
Football. the area of the field immediately inside of or outside of an offensive end, close behind or at the line of scrimmage.
51.
flats, Informal. flat races between horses.
Compare .
verb (used with object), flatted, flatting.
52.
to make flat.
53.
Music. to lower (a pitch), especially one half step.
verb (used without object), flatted, flatting.
54.
to become flat.
adverb
55.
in a flat position; horizontally; levelly.
56.
in a flat manner; positively; absolutely.
57.
completely; utterly:
flat broke.
58.
exactly; precisely:
She ran around the track in two minutes flat.
59.
Music. below the true pitch:
to sing flat.
60.
Finance. without interest.
Verb phrases
61.
flat in, Nautical. to pull the clew of (a fore-and-aft sail) as nearly amidships as possible.
Also, flatten in.
Idioms
62.
fall flat, to fail to produce the desired effect; fail completely:
His attempts at humor fell flat.
63.
flat aft, Nautical. trimmed so that fore-and-aft sails present as flat a surface as possible, as in sailing close to the wind.
64.
flat on one’s back. 1 (def 47).
65.
flat out, Informal.

/flæt/
adjective flatter, flattest
1.
horizontal; level: flat ground, a flat roof
2.
even or smooth, without projections or depressions: a flat surface
3.
lying stretched out at full length; prostrate: he lay flat on the ground
4.
having little depth or thickness; shallow: a flat dish
5.
(postpositive) often foll by against. having a surface or side in complete contact with another surface: flat against the wall
6.
spread out, unrolled, or levelled
7.
(of a tyre) deflated, either partially or completely
8.
(of shoes) having an unraised or only slightly raised heel
9.
(mainly Brit)

10.
without qualification; total: a flat denial
11.
without possibility of change; fixed: a flat rate
12.
(prenominal or immediately postpositive) neither more nor less; exact: he did the journey in thirty minutes flat, a flat thirty minutes
13.
unexciting or lacking point or interest: a flat joke
14.
without variation or resonance; monotonous: a flat voice
15.
(of food) stale or tasteless
16.
(of beer, sparkling wines, etc) having lost effervescence, as by exposure to air
17.
(of trade, business, a market, etc) commercially inactive; sluggish
18.
(of a battery) fully discharged; dead
19.
(of a print, photograph, or painting) lacking contrast or shading between tones
20.
(of paint) without gloss or lustre; matt
21.
(of a painting) lacking perspective
22.
(of lighting) diffuse
23.
(music)

24.
(phonetics) another word for lenis
25.
(phonetics) flat a, the vowel sound of a as in the usual US or S Brit pronunciation of hand, cat, usually represented by the symbol (æ)
adverb
26.
in or into a prostrate, level, or flat state or position: he held his hand out flat
27.
completely or utterly; absolutely: he went flat against the rules
28.
exactly; precisely: in three minutes flat
29.
(music)

30.
fall flat, to fail to achieve a desired effect, etc
31.
(informal) flat out

noun
32.
a flat object, surface, or part
33.
(often pl) a low-lying tract of land, esp a marsh or swamp
34.
(often pl) a mud bank exposed at low tide
35.
(music)

36.
(theatre) a rectangular wooden frame covered with painted canvas, etc, used to form part of a stage setting
37.
a punctured car tyre
38.
(mainly Brit) ((often cap.)) the flat

39.
(nautical) a flatboat or lighter
40.
(US & Canadian) a shallow box or container, used for holding plants, growing seedlings, etc
verb flats, flatting, flatted
41.
to make or become flat
42.
(music) the usual US word for flatten (sense 3)
/flæt/
noun
1.
a set of rooms comprising a residence entirely on one floor of a building Usual US and Canadian name apartment
2.
(Brit & NZ) a portion of a house used as separate living quarters
3.
(NZ) a house shared with people who are not members of one’s own family
verb (intransitive) flats, flatting, flatted
4.
(Austral & NZ) to live in a flat (with someone)
n.

mid-15c., from flat (adj.) + -ness.
adj.

early 14c., from Old Norse flatr, from Proto-Germanic *flataz (cf. Old Saxon flat “flat, shallow,: Old High German flaz “flat, level,” Old English flet, Old High German flezzi “floor”), perhaps from PIE *plat- “to spread” (cf. Greek platys “broad, flat;” see plaice (n.)).

Sense of “prosaic, dull” is from 1570s; used of drink from c.1600; of musical notes from 1590s, because the tone is “lowered.” Flat-out (adv.) “openly, directly” is from 1932; earlier it was a noun meaning “total failure” (1870, U.S. colloquial).
n.

1801, from Scottish flat “floor or story of a house,” from Old English flet “a dwelling, floor, ground,” from the same source as flat (adj.).