/ krɒtʃ; NAmE krɑːtʃ/ (also crutch ) noun
1.
the part of the body where the legs join at the top, including the area around the genitals
2.
the part of a pair of trousers / pants, etc. that covers the crotch :
There's a hole in the crotch.
••
WORD ORIGIN
mid 16th cent. (denoting an agricultural or garden fork, also a crutch): perhaps related to Old French croche crozier, shepherd's crook, based on Old Norse krókr hook; partly also a variant of crutch .