The Collaborative International Dictionary of English v.0.48:

Squash \Squash\, n.
   1. Something soft and easily crushed; especially, an unripe
      pod of pease.
      [1913 Webster]

            Not yet old enough for a man, nor young enough for a
            boy; as a squash is before 't is a peascod. --Shak.
      [1913 Webster]

   2. Hence, something unripe or soft; -- used in contempt.
      "This squash, this gentleman." --Shak.
      [1913 Webster]

   3. A sudden fall of a heavy, soft body; also, a shock of soft
      bodies. --Arbuthnot.
      [1913 Webster]

            My fall was stopped by a terrible squash. --Swift.
      [1913 Webster]

   4. A game much like rackets, played in a walled court with
      soft rubber balls and bats like tennis rackets; -- called
      also squash rackets.
      [PJC]

WordNet (r) 3.0 (2006):

squash rackets
    n 1: a game played in an enclosed court by two or four players
         who strike the ball with long-handled rackets [syn:
         squash, squash racquets, squash rackets]