crotch
/krɒtʃ/noun
1- the part of the human body between the legs where they join the torso（人体的）两腿分叉处, 胯部。
1.1
- the part of a garment that passes between the legs（衣服的）裤裆。
1.2
- a fork in a tree, road, or river（树, 道路或河流的）分叉处。
词源
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.