fatigue duty

noun

1. physical or mental exhaustion; weariness
2. the cause of this; hard work; toil
3. any manual labor or menial duty, other than drill or instruction, assigned to soldiers
   in full fatigue duty
4. sturdy work clothing worn by soldiers doing fatigue duty
   also fatigue clothes (or clothing)
5. the tendency of a metal or other material to crack and fail under repeated applications of stress
6. Physiol. the decreased ability to function or inability to respond of an organism or one of its parts due to prolonged exertion or repeated stimulation

transitive verb, intransitive verb fatigued, fatiguing

1. to make or become tired or exhausted; weary
2. to subject to or undergo fatigue