To fall in Meaning, Definition & Usage

Definitions
  1. . (a) To sink inwards; as, the roof fell in. (b) (Mil.) To take one's proper or assigned place in line; as, to fall in on the right. (c) To come to an end; to terminate; to lapse; as, on the death of Mr. B., the annuuity, which he had so long received, fell in. (d) To become operative. "The reversion, to which he had been nominated twenty years before, fell in." Macaulay.

Webster 1913