Definition of drop crotch in English:

drop crotch

(also dropped crotch)

noun

  • usually as modifier A crotch on a pair of trousers that is designed to sag down loosely toward the knees.

    ‘the drop-crotch bottoms came in danger of falling completely off’
    ‘dropped-crotch pants’
    ‘the drop crotch isn't flattering on even her perfect frame’