Etymology
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crotch (n.)

1530s, "pitchfork," from Old North French croche "shepherd's crook," variant of croc "hook," from Old Norse krokr "hook," which is of obscure origin but perhaps related to the widespread group of Germanic kr- words meaning "bent, hooked."

From 1570s as "any fork or forking," especially "a parting of branches of a tree;" meaning "region where the body forks" is attested from 1590s. Hence crotchcutter "women's bathing suit with leg openings which reach above the hips" (by 1997).

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Definitions of crotch

crotch (n.)
the region of the angle formed by the junction of two branches;
he climbed into the crotch of a tree
Synonyms: fork
crotch (n.)
the angle formed by the inner sides of the legs where they join the human trunk;
Synonyms: fork
crotch (n.)
external sex organ;
Synonyms: genitalia / genital organ / genitals / private parts / privates
From wordnet.princeton.edu