(intransitive) To lose strength and become weak; to be in a state of weakness or sickness.

(intransitive) To pine away in longing for something; to have low spirits, especially from lovesickness.

(intransitive) To live in miserable or disheartening conditions.

(intransitive) To be neglected; to make little progress, be unsuccessful.

(transitive, obsolete) To make weak; to weaken, devastate.

(intransitive, now rare) To affect a languid air, especially disingenuously.