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free or released from fastening or attachment:
a loose end.
free from anything that binds or restrains; unfettered:
loose cats prowling around in alleyways at night.
uncombined, as a chemical element.
not bound together:
to wear one’s hair loose.
not put up in a package or other container:
loose mushrooms.
available for disposal; unused; unappropriated:
loose funds.
lacking in reticence or power of restraint:
a loose tongue.
lax, as the bowels.
lacking moral restraint or integrity; notorious for his loose character.
sexually promiscuous or immoral; unchaste.
not firm, taut, or rigid:
a loose tooth; a loose rein.
relaxed or limber in nature:
He runs with a loose, open stride.
not fitting closely or tightly:
a loose sweater.
not close or compact in structure or arrangement; having spaces between the parts; open:
a loose weave.
having few restraining factors between associated constituents and allowing ample freedom for independent action:
a loose federation of city-states.
not cohering:
loose sand.
not strict, exact, or precise:
a loose interpretation of the law.
Sports.

having the players on a team positioned at fairly wide intervals, as in a football formation.
(of a ball, hockey puck, etc.) not in the possession of either team; out of player control.

in a loose manner; loosely (usually used in combination):
loose-flowing.
to let loose; free from bonds or restraint.
to release, as from constraint, obligation, or penalty.
Chiefly Nautical. to set free from fastening or attachment:
to loose a boat from its moorings.
to unfasten, undo, or untie, as a bond, fetter, or knot.
to shoot; discharge; let fly:
to loose missiles at the invaders.
to make less tight; slacken or relax.
to render less firmly fixed; lessen an attachment; loosen.
to let go a hold.
to hoist anchor; get under way.
to shoot or let fly an arrow, bullet, etc. (often followed by off):
to loose off at a flock of ducks.
Obsolete. to become loose; loosen.
break loose, to free oneself; escape:
The convicts broke loose.
cast loose,

to loosen or unfasten, as a ship from a mooring.
to send forth; set adrift or free:
He was cast loose at an early age to make his own way in the world.

cut loose,

to release from domination or control.
to become free, independent, etc.
to revel without restraint:
After the rodeo they headed into town to cut loose.

hang / stay loose, Slang. to remain relaxed and unperturbed.
let loose,

to free or become free.
to yield; give way:
The guardrail let loose and we very nearly plunged over the edge.

on the loose,

free; unconfined, as, especially, an escaped convict or circus animal.
behaving in an unrestrained or dissolute way:
a bachelor on the loose.

turn loose, to release or free, as from confinement:
The teacher turned the children loose after the class.
Contemporary Examples

Luis Suarez, Uruguay’s Notorious Soccer Vampire, Strikes Again—Biting Italian in World Cup Win Tunku Varadarajan June 23, 2014
Lessons For Both Sides Peter Beinart November 20, 2012
New Trial Of The Century? Marcia Clark July 1, 2009

Historical Examples

The Adventures of Captain Bonneville Washington Irving
Christianity As A Mystical Fact Rudolf Steiner
Sword and Gown George A. Lawrence
No Clue James Hay
Health Lessons Alvin Davison
The Rival Crusoes W.H.G. Kingston
Dick Hamilton’s Fortune Howard R. Garis

adjective
free or released from confinement or restraint
not close, compact, or tight in structure or arrangement
not fitted or fitting closely: loose clothing is cooler
not bundled, packaged, fastened, or put in a container: loose nails
inexact; imprecise: a loose translation
(of funds, cash, etc) not allocated or locked away; readily available

(esp of women) promiscuous or easy
(of attitudes, ways of life, etc) immoral or dissolute

lacking a sense of responsibility or propriety: loose talk

(of the bowels) emptying easily, esp excessively; lax
(of a cough) accompanied by phlegm, mucus, etc

(of a dye or dyed article) fading as a result of washing; not fast
(informal, mainly US & Canadian) very relaxed; easy
noun
(rugby) the loose, the part of play when the forwards close round the ball in a ruck or loose scrum See scrum
on the loose

free from confinement or restraint
(informal) on a spree

adverb

in a loose manner; loosely
(in combination): loose-fitting

(informal, mainly US) hang loose, to behave in a relaxed, easy fashion
verb
(transitive) to set free or release, as from confinement, restraint, or obligation
(transitive) to unfasten or untie
to make or become less strict, tight, firmly attached, compact, etc
when intr, often foll by off. to let fly (a bullet, arrow, or other missile)
adj.

You can reason with a bull dog, astonish a bull, fascinate a boa, frighten a tiger, soften a lion; no resource with such a monster as a loose cannon. You cannot kill it, it is dead; and at the same time it lives. It lives with a sinister life which comes from the infinite. It is moved by the ship, which is moved by the sea, which is moved by the wind. This exterminator is a plaything. [Victor Hugo, “Ninety Three”]

Loose end in reference to something unfinished, undecided, unguarded is from 1540s; to be at loose ends is from 1807. Phrase on the loose “free, unrestrained” is from 1749 (upon the loose).
v.

Relaxed; easy; cool: No wonder you guys were really loose/ You are loose in the rush, misty and safe (1950s+ Cool talk)
Sexually promiscuous (1595+)

Escape from restraint, as in The boat broke loose from its moorings, or He finally broke loose from the school of abstract expressionism. This expression also appears in all hell breaks loose, which indicates a state of fury or chaos, as in When Dad finds out you broke his watch, all hell will break loose, or When the children saw the dead pigeon in the hall, all hell broke loose. [ Early 1400s ]

loose cannon
loose ends