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substitute

substitute - noun

  1. One that takes the place of another: alternate, replacement, stand-in, surrogate. Informal fill-in, pinch hitter, sub. See substitute.

substitute - verb

  1. To give up in return for something else: change, commute, exchange, interchange, shift, switch, trade. Informal swap. See change. substitute.
  2. To act as a substitute: fill in, stand in, supply. Informal pinch-hit, sub. See substitute.