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trap (n.)

"contrivance for catching unawares," late Old English træppe, treppe "snare, trap," from Proto-Germanic *trep- (source also of Middle Dutch trappe "trap, snare"), related to Germanic words for "stair, step, tread" (Middle Dutch, Middle Low German trappe, treppe, German Treppe "step, stair," English tread (v.)).

This is probably literally "that on or into which one steps," from PIE *dreb-, an extended form of a root *der- (1), base of words meaning "to run, walk, step." The English word is probably akin to Old French trape, Spanish trampa "trap, pit, snare," but the exact relationship is uncertain.

The sense of "deceitful practice, device or contrivance to betray one" is recorded from c. 1400. The meaning "U-shaped section of a drain pipe" is from 1833. Slang meaning "mouth" is from 1776. Speed trap is by 1908. Trap-door "door in a floor or ceiling" (often hidden and leading to a passageway or secret place) is attested from late 14c. (trappe-dore).

trap (v.)

late 14c., "ensnare (an animal), catch in a trap; encircle; capture," from trap (n.) or from Old English betræppan. Figurative use is slightly earlier (late 14c.). Related: Trapped; trapping.

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Definitions of trap from WordNet
1
trap (n.)
a device in which something (usually an animal) can be caught and penned;
trap (n.)
drain consisting of a U-shaped section of drainpipe that holds liquid and so prevents a return flow of sewer gas;
trap (n.)
something (often something deceptively attractive) that catches you unawares;
the exam was full of trap questions
Synonyms: snare
trap (n.)
a device to hurl clay pigeons into the air for trapshooters;
trap (n.)
the act of concealing yourself and lying in wait to attack by surprise;
Synonyms: ambush / ambuscade / lying in wait
trap (n.)
informal terms for the mouth;
Synonyms: cakehole / hole / maw / yap / gob
trap (n.)
a light two-wheeled carriage;
trap (n.)
a hazard on a golf course;
Synonyms: bunker / sand trap
2
trap (v.)
place in a confining or embarrassing position;
He was trapped in a difficult situation
Synonyms: pin down
trap (v.)
catch in or as if in a trap;
The men trap foxes
Synonyms: entrap / snare / ensnare / trammel
trap (v.)
hold or catch as if in a trap;
The gaps between the teeth trap food particles
trap (v.)
to hold fast or prevent from moving;
Synonyms: pin / immobilize / immobilise
From wordnet.princeton.edu