Etymology
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lock (n.1)

"means of fastening," Old English loc "bolt, appliance for fastening a door, lid, etc.; barrier, enclosure; bargain, agreement, settlement, conclusion," from Proto-Germanic *lukana-, a verbal root meaning "to close" (source also of Old Frisian lok "enclosure, prison, concealed place," Old Norse lok "fastening, lock," Gothic usluks "opening," Old High German loh "dungeon," German Loch "opening, hole," Dutch luik "shutter, trapdoor").

Ordinary mechanical locks work by means of an internal bolt or bar which slides and catches in an opening made to receive it. "The great diversity of meaning in the Teut. words seems to indicate two or more independent but formally identical substantival formations from the root" [OED]. The Old English sense "barrier, enclosure" led to the specific meaning "barrier on a stream or canal" (c. 1300), and the more specific sense "gate and sluice system on a water channel used as a means of raising and lowering boats" (1570s).

From 1540s as "a fastening together," hence "a grappling in wrestling" (c. 1600). In firearms, the part of the mechanism which explodes the charge (1540s, probably so called for its resemblance to a door-latching device), hence figurative phrase lock, stock, and barrel (which add up to the whole firearm) "the whole of something" (1842). Phrase under lock and key attested from early 14c.

lock (n.2)

"tress of hair," Old English locc "lock of hair, curl" (plural loccas), from Proto-Germanic *lukkoz (source also of Old Norse lokkr, Old Saxon, Old Frisian, Dutch lok, Old High German loc, German Locke "lock of hair"), a word of uncertain origin. According to OED, perhaps from a PIE *lugnos- and related to Greek lygos "pliant twig, withe," Lithuanian lugnas "flexible" (see reluctance).

lock (v.)

c. 1300, "to fasten with a lock, shut or confine with a lock." The sense is narrowed from that of Old English lucan "to lock, to close" (class II strong verb; past tense leac, past participle locen), from the same verbal root that yielded lock (n.1). The form is from the noun (perhaps reinforced by Old Norse loka); the old original strong verb survived as dialectal louk, and the strong past participle locken lingered a while, as in Middle English loken love "hidden love, clandestine love" (early 14c.).

The Old English verb is cognate with Old Frisian luka "to close," Old Saxon lukan, Old High German luhhan, Old Norse luka, Gothic galukan. Meaning "to fasten parts together" is from late 14c., originally of armor; of persons, "to embrace closely," from mid-14c. Related: Locked; locking. Locked "securely established" is from early 15c. To lock (someone) in "shut in a place" is from c. 1400. Slang lock horns "fight" is from 1839.

updated on December 07, 2018

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Definitions of lock from WordNet
1
lock (v.)
fasten with a lock;
lock the bike to the fence
lock (v.)
keep engaged;
Synonyms: engage / mesh / operate
lock (v.)
become rigid or immoveable;
The therapist noticed that the patient's knees tended to lock in this exercise
lock (v.)
hold in a locking position;
He locked his hands around her neck
Synonyms: interlock / interlace
lock (v.)
become engaged or intermeshed with one another;
They were locked in embrace
Synonyms: interlock
lock (v.)
hold fast (in a certain state);
He was locked in a laughing fit
lock (v.)
place in a place where something cannot be removed or someone cannot escape;
The parents locked her daughter up for the weekend
She locked her jewels in the safe
Synonyms: lock in / lock away / put away / shut up / shut away / lock up
lock (v.)
pass by means through a lock in a waterway;
lock (v.)
build locks in order to facilitate the navigation of vessels;
2
lock (n.)
a fastener fitted to a door or drawer to keep it firmly closed;
lock (n.)
a strand or cluster of hair;
Synonyms: curl / ringlet / whorl
lock (n.)
a mechanism that detonates the charge of a gun;
lock (n.)
enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it;
Synonyms: lock chamber
lock (n.)
a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key;
Synonyms: ignition lock
lock (n.)
any wrestling hold in which some part of the opponent's body is twisted or pressured;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.