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exertion

exertion - noun

  1. The act of putting into play: application, employment, exercise, implementation, operation, play, usage, use, utilization. See used.
  2. The use of energy to do something: effort, endeavor, pain(used in plural), strain, striving, struggle, trouble, while. Informal elbow grease. See work.
  3. Energetic physical action: activity, exercise. See action.