Meaning: This adjective is a British slang for very tired. It also means broken or too old to use.
Origin: Knackered is derived from the past participle of knacker, a slang term meaning “to kill” as well as “to tire, exhaust, or wear out.” The origins of the verb knacker are uncertain, but the word is perhaps related to an older noun knacker, which originally referred to a harness-maker, and later referred to a buyer of animals no longer able to do farm work.
Usage: I’m never too knackered to go out with friends.
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