1) n. branch union or fork. 2) v. to place a line through a branch union.

Merriam-Webster Online Dictionary
crotch (noun)
1.
a pole with a forked end used especially as a prop
2.
an angle formed by the parting of two legs, branches, or members
crotch (Wikipedia)

In humans, the crotch is the bottom of the pelvis, the region of the body where the legs join the torso, and is often considered to include the groin and genitals.

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