One of the mysteries of the English language finally explained.
1Worn out, incapacitated, rendered useless, as with continuous hard work, age, or excess; no longer competent or effective.
2Emotionally or mentally exhausted.
3Of appearance, comportment, etc.: which has a worn-out or wearied quality. In quot. 1853 as noun: the language of the worn-out or weary.
4Thoroughly exhausted by physical exertion or hardship; tired out, fatigued.
5Of a thing: that has been utilized to maximum capacity or usefulness; reduced or consumed through use.
Early 19th century; earliest use found in ‘Jon Bee’ (fl. 1816–1830) (real name John Badcock). From used + up, after to use up.
used up/ˌjuːzd ˈʌp/
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