fatigue

noun

• 1 [mass noun] extreme tiredness resulting from mental or physical exertion or illness:he was nearly dead with fatigue
• a reduction in the efficiency of a muscle or organ after prolonged activity: buccinator and orbicularis oris muscles showing signs of fatigue
• [with modifier] a lessening in one’s response to or enthusiasm for something, caused by overexposure:votes were showing signs of election fatigue

• 2weakness in metal or other materials caused by repeated variations of stress:metal fatigue

• 3 (fatigues) menial non-military tasks performed by a soldier, sometimes as a punishment:we’re on cookhouse fatigues, sir
• (also fatigue party) [count noun] a group of soldiers ordered to do menial tasks.

• 4 (fatigues) loose clothing, typically khaki, olive drab, or camouflaged, of a sort worn by soldiers on active duty:battle fatigues

verb (fatigues, fatiguing, fatigued)

• cause (someone) to feel exhausted:they were fatigued by their journey
• reduce the efficiency of (a muscle or organ) by prolonged activity: different sensory fibres within the normal retina could be selectively fatigued
• weaken (a metal or other material) by repeated variations of stress: the nails have become rusted through or fatigued