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noun
1.
a slender, typically rod-shaped rigid piece of metal, usually in any of numerous standard lengths from a fraction of an inch to several inches and having one end pointed and the other enlarged and flattened, for hammering into or through wood, other building materials, etc., as used in building, in fastening, or in holding separate pieces together.
2.
a thin, horny plate, consisting of modified epidermis, growing on the upper side of the end of a finger or toe.
3.
a former measure of length for cloth, equal to 2¼ inches (6.4 cm).
verb (used with object)
4.
to fasten with a nail or nails:
to nail the cover on a box.
5.
to enclose or confine (something) by nailing (often followed by up):
to nail up oranges in a crate.
6.
to make fast or keep firmly in one place or position:
Surprise nailed him to the spot.
7.
to accomplish perfectly:
the only gymnast to nail the dismount.
8.
Informal.

to secure by prompt action; catch or seize:
The police nailed him with the goods.
to catch (a person) in some difficulty, lie, etc.
to detect and expose (a lie, scandal, etc.).

9.
Slang. to hit (a person):
He nailed him on the chin with an uppercut in the first round.
10.
to focus intently on an object or subject:
She kept her eyes nailed on the suspicious customer.
11.
Obsolete. to stud with or as if with nails.
Verb phrases
12.
nail down, to make final; settle once and for all:
Signing the contract will nail down our agreement.
Idioms
13.
hit the nail on the head, to say or do exactly the right thing; be accurate or correct:
Your analysis really hit the nail on the head.
14.
nail in someone’s / something’s coffin, something that hastens the demise or failure of a person or thing:
Every moment’s delay is another nail in his coffin.
15.
on the nail, Informal.

of present interest; under discussion.
without delay; on the spot; at once:
He was offered a job on the nail.

noun
1.
a fastening device usually made from round or oval wire, having a point at one end and a head at the other
2.
anything resembling such a fastening device, esp in function or shape
3.
the horny plate covering part of the dorsal surface of the fingers or toes See fingernail, toenail related adjectives ungual ungular
4.
the claw of a mammal, bird, or reptile
5.
(slang) a hypodermic needle, used for injecting drugs
6.
a unit of length, formerly used for measuring cloth, equal to two and a quarter inches
7.
a nail in one’s coffin, an experience or event that tends to shorten life or hasten the end of something
8.
bite one’s nails

to chew off the ends of one’s fingernails
to be worried or apprehensive

9.
hard as nails

in tough physical condition
without sentiment or feelings

10.
hit the nail on the head, to do or say something correct or telling
11.
on the nail, (of payments) at once (esp in the phrase pay on the nail)
verb (transitive)
12.
to attach with or as if with nails
13.
(informal) to arrest or seize
14.
(informal) to hit or bring down, as with a shot: I nailed the sniper
15.
(informal) to expose or detect (a lie or liar)
16.
to fix or focus (one’s eyes, attention, etc) on an object
17.
to stud with nails

nail (nāl)
n.

A fingernail or toenail.

A slender rod used in operations to fasten together the divided extremities of a broken bone.

nail

for fastening. (1.) Hebrew yathed, “piercing,” a peg or nail of any material (Ezek. 15:3), more especially a tent-peg (Ex. 27:19; 35:18; 38:20), with one of which Jael (q.v.) pierced the temples of Sisera (Judg. 4:21, 22). This word is also used metaphorically (Zech. 10:4) for a prince or counsellor, just as “the battle-bow” represents a warrior. (2.) Masmer, a “point,” the usual word for a nail. The words of the wise are compared to “nails fastened by the masters of assemblies” (Eccl. 12:11, A.V.). The Revised Version reads, “as nails well fastened are the words of the masters,” etc. Others (as Plumptre) read, “as nails fastened are the masters of assemblies” (comp. Isa. 22:23; Ezra 9:8). David prepared nails for the temple (1 Chr. 22:3; 2 Chr. 3:9). The nails by which our Lord was fixed to the cross are mentioned (John 20:25; Col. 2:14). Nail of the finger (Heb. tsipporen, “scraping”). To “pare the nails” is in Deut. 21:12 (marg., “make,” or “dress,” or “suffer to grow”) one of the signs of purification, separation from former heathenism (comp. Lev. 14:8; Num. 8:7). In Jer. 17:1 this word is rendered “point.”