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