a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, dial, etc.
2.
a contrivance for fastening or securing something.
any device or part for stopping temporarily the motion of a mechanism.
5.
an enclosed chamber in a canal, dam, etc., with gates at each end, for raising or lowering vessels from one level to another by admitting or releasing water.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
to commit unalterably: to lock in the nomination of the party's candidates.
b.
(of an investor) to be unable or unwilling to sell or shift securities.
25.
lock off, to enclose (a waterway) with a lock.
26.
lock on, to track or follow a target or object automatically by radar or other electronic means.
27.
lock out,
a.
to keep out by or as if by a lock.
b.
to subject (employees) to a lockout.
28.
lock up,
a.
to imprison for a crime.
b.
Printing. to make (type) immovable in a chase by securing the quoins.
c.
to fasten or secure with a lock or locks.
d.
to lock the doors of a house, automobile, etc.
e.
to fasten or fix firmly, as by engaging parts.
Idioms
29.
lock horns, to come into conflict; clash: to lock horns with a political opponent.
30.
lock, stock, and barrel, completely; entirely; including every part, item, or facet, no matter how small or insignificant: We bought the whole business, lock, stock, and barrel.
31.
under lock and key, securely locked up: The documents were under lock and key.
Origin: before 900; Middle English; Old English loc fastening, bar; cognate with Middle Low German lok,Old High German loh,Old Norse lok a cover, lid, Gothic -luk in usluk opening; akin to Old English lūcan to shut
"tress of hair," from O.E. locc, from P.Gmc. *lukkoz (cf. O.N. lokkr, O.Fris., Du. lok, Ger. Locke "lock of hair"), from PIE *lugnos-, from base *lug- "to bend, to twist" (cf. Gk. lygos "pliant twig, withe," Lith. lugnas "flexible").