Etymology
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sit (v.)

Old English sittan "to occupy a seat, be seated, sit down, seat oneself; remain, continue; settle, encamp, occupy; lie in wait; besiege" (class V strong verb; past tense sæt, past participle seten), from Proto-Germanic *setjan (source also of Old Saxon sittian, Old Norse sitja, Danish sidde, Old Frisian sitta, Middle Dutch sitten, Dutch zitten, Old High German sizzan, German sitzen, Gothic sitan), from PIE root *sed- (1) "to sit."

With past tense sat, formerly also set, now restricted to dialect, and sate, now archaic; and past participle sat, formerly sitten. In reference to a legislative assembly, from 1510s. Meaning "to baby-sit" is recorded from 1966.

To sit back "be inactive" is from 1943. To sit on one's hands was originally "to withhold applause" (1926); later, "to do nothing" (1959). To sit around "be idle, do nothing" is 1915, American English. To sit out "not take part" is from 1650s. Sitting pretty is from 1916.

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Definitions of sit

sit (v.)
be seated;
Synonyms: sit down
sit (v.)
be around, often idly or without specific purpose;
The object sat in the corner
We sat around chatting for another hour
Synonyms: sit around
sit (v.)
take a seat;
Synonyms: sit down
sit (v.)
be in session;
When does the court of law sit?
sit (v.)
assume a posture as for artistic purposes;
Synonyms: model / pose / posture
sit (v.)
sit and travel on the back of animal, usually while controlling its motions;
She never sat a horse!
Synonyms: ride
sit (v.)
be located or situated somewhere;
The White House sits on Pennsylvania Avenue
sit (v.)
work or act as a baby-sitter; "I cannot baby-sit tonight; I have too much homework to do";
Synonyms: baby-sit / babysit
sit (v.)
show to a seat; assign a seat for;
Synonyms: seat / sit down
sit (v.)
serve in a specific professional capacity;
the priest sat for confession
she sat on the jury
From wordnet.princeton.edu