名詞 crotch:

1. the region of the angle formed by the junction of two branches
   同義詞：fork
2. the angle formed by the inner sides of the legs where they join the human trunk
   同義詞：fork
3. external sex organ
   同義詞：genitalia, genital organ, genitals, private parts, privates

crotch

n.（名詞）
The angle or region of the angle formed by the junction of two parts or members, such as two branches, limbs, or legs.
胯部：由兩個分支、兩條手臂或兩條腿等兩個部分交叉而成的角區(qū)或區(qū)域
The fork of a pole or other support.
叉：柱子或其它支承物的叉狀部件

來源：
Possibly alteration of crutch
可能為 crutch的變化
and partly from croche [crook, crosier] from Old French croche [hook, shepherd`s crook] [feminine of] croc [hook]
并且部分源自 croche [曲杯杖，權(quán)杖] 源自 古法語 croche [彎鉤，牧羊杖] [] croc的陰性詞 [彎鉤]

【引伸】
crotched