Definition of crotches:
(n) :
The ventral area (very bottom) of the human body between where the legs fork from the torso, in the area of the genitals and anus.
(n) :
(slang, euphemistic) Either the male or female genitalia.
(n) :
The area where something forks or branches: where a ramification takes place.
(n) :
(billiards) In the three-ball carom game, a small space at each corner of the table.
(n) :
(typography) The open counter (negative space) formed by two downward strokes that meet at an internal acute angle, potentially above a vertex, as in the letters "V" and "Y".
(v) :
(transitive) To provide with a crotch; to give the form of a crotch to.