fatigue

Short definition from Wiktionary

Noun

1. 1
   A weariness caused by exertion; exhaustion.
2. 2
   A menial task or tasks, especially in the military.
3. 3
   Weakening and eventual failure of material, typically by cracking leading to complete separation, caused by repeated application of mechanical stress to the material.
4. 4
   Attributive form of fatigues (“military clothing worn when doing menial tasks”).

Verb

1. 1
   To tire or make weary by physical or mental exertion.
2. 2
   To wilt a salad by dressing or tossing it.
3. 3
   To lose so much strength or energy that one becomes tired, weary, feeble or exhausted.
4. 4
   To undergo the process of fatigue; to fail as a result of fatigue.
5. 5
   To cause to undergo the process of fatigue.