Extremely tiring or draining, either physically or mentally; using up almost all of something.
From Latin 'exhaurire' (ex- 'out' + haurire 'to draw') meaning to drain completely. The present participle form emerged in English by the 1600s to describe both the act of draining and the resulting exhaustion.
The word literally means 'to draw out completely'—which is exactly what a hard day does to your energy reserves, making it one of the most accurately named feelings in English.
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