In the game of contract bridge, CRASH (an acronym for Color-RAnk-SHape) is a defense against a strong 1 or a 1NT opening that first appeared in 1976 in an article by Kit Woolsey in The Bridge World.
In the context of contract bridge, CRASH refers to a defensive strategy against aggressive 1 and 1NT openings, which was first introduced by Kit Woolsey in an article published in The Bridge World magazine in 1976.