n(1) 疲劳(乏，倦);劳累(great tiredness resulting from hard work or efforts) [U]：physical/mental～体力/精神上的疲劳;suffer from～感到疲劳;drop with～由于疲劳而倒下(死去);relieve sb of his～使某人解除疲劳;His～was great after climbing the mountain. 登山之后，他感到极为疲倦。〖同〗tiredness，exhaustion，weariness，overtiredness;〖反〗energy，vigour;

(2) (金属材料的) 疲劳(weakness in metals caused by continued use) [U]：show signs of metal～出现金属疲劳的迹象;Metal～is the chief reason for the air crash. 金属疲劳是造成这次飞机失事的主要原因。

(3) 令人疲惫的工作;(军队中的) 杂务(manual labour;hard work done by a soldier which is not a military nature) [C]：make sb do～s 迫使某人干重活;put sb on～s 让某人干杂务;be on～duty (轮到)干杂务;recover from～s 从疲惫的工作中恢复过来;

(4) (士兵干杂务时穿的) 工作服(clothing worn by soldiers for heavy duty or field work) [pl];

→ fa′tigueless adj 不知疲劳的;fa′tiguesome adj 累人的;

v 使疲劳(cause sb to feel very tired) [T+n]：feel/get～d 感到/搞得很累;The work～d the man. 工作使那人非常疲劳。He was～d by the march. 他被行军累坏了。find sth～ing 发现某事很累人;The work is very～ing. 这项工作很累人。～ing work 让人疲惫不堪的工作;The patient～s easily. 病人很容易疲劳。〖同〗 exhaust，tire，overtire，weary;〖反〗 rest，refresh，restore，renew，relieve;

【注意】 fatigue的-ing 形式一般用作形容词。