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To Be Exhausted
To Be Used Up, To Exhaust, To Use Up
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means exhaust and the verb vocab version is to exhaust.
If something is exhausted it's because you used up too (つ) much of it.
While combing her fingers through her hair she told me that she had already fallen out of love with me.