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Knacker

usgb/ˈnækər/Volume
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Colloquial UsePlay
Used informally among friends or in casual conversation, not in formal speech or writing. SlideI'm knackered after the gym session.
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British SlangPlay
Predominantly a British term, might confuse speakers of other English varieties. SlideMarathon training has me absolutely knackered!
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Physical ExhaustionPlay
Often refers to being physically exhausted rather than emotionally or mentally tired. SlideAfter moving all those boxes, I was knackered.