Definitions from Wiktionary ( )

▸ verb:  (intransitive) To lose strength and become weak; to be in a state of weakness or sickness.
▸ verb:  (intransitive) To pine away in longing for something; to have low spirits, especially from lovesickness.
▸ verb:  (intransitive) To live in miserable or disheartening conditions.
▸ verb:  (intransitive) To be neglected; to make little progress, be unsuccessful.
▸ verb:  (transitive, obsolete) To make weak; to weaken, devastate.
▸ verb:  (intransitive, now rare) To affect a languid air, especially disingenuously.

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