noun Extreme tiredness resulting from mental or physical exertion or illness. (he was nearly dead with fatigue) Weakness in materials, especially metal, caused by repeated variations of stress. (metal fatigue) Menial non-military tasks performed by a soldier, sometimes as a punishment. Loose-fitting clothing, typically khaki, olive drab, or camouflaged, worn by soldiers. (battle fatigues)
verb Cause (someone) to feel tired or exhausted. (they were fatigued by their journey) Weaken (a material, especially metal) by repeated variations of stress.