Etymology
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wrench (v.)

Old English wrencan "to twist," from Proto-Germanic *wrankjan (source also of Old High German renken, German renken "to twist, wrench," Old English wringan "to wring"), from PIE *wreng- "to turn" (source also of Sanskrit vrnakti "turns, twists," Lithuanian rengtis "to grow crooked, to writhe"), nasalized variant of *werg- "to turn" (source also of Latin vergere "to turn, tend toward"), from root *wer- (2) "to turn, bend." Related: Wrenched, wrenching.

wrench (n.)

Old English wrenc "a twisting, artifice, trick;" see wrench (v.). The meaning "tool with jaws at one end for turning or holding" is first recorded 1794.

updated on May 03, 2017

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Definitions of wrench from WordNet
1
wrench (v.)
twist or pull violently or suddenly, especially so as to remove (something) from that to which it is attached or from where it originates;
a deep sigh was wrenched from his chest
wrench oneself free from somebody's grip
wrench a window off its hinges
Synonyms: twist
wrench (v.)
make a sudden twisting motion;
wrench (v.)
twist and compress, as if in pain or anguish;
Synonyms: wring
wrench (v.)
twist suddenly so as to sprain;
wrench one's ankle
Synonyms: twist / sprain / turn / wrick / rick
2
wrench (n.)
a sharp strain on muscles or ligaments;
the wrench to his knee occurred as he fell
Synonyms: twist / pull
wrench (n.)
a jerky pulling movement;
Synonyms: twist
wrench (n.)
a hand tool that is used to hold or twist a nut or bolt;
Synonyms: spanner
From wordnet.princeton.edu, not affiliated with etymonline.