The possibility of a relapse would of course, in some moments, occur to remind her of what anxiety was— but when she saw, on her frequent and minute examination, that every symptom of recovery continued, and saw Marianne at six o’clock sink into a quiet, steady, and to all appearance comfortable, sleep, she silenced every doubt.
There are no more uses of "relapse" in the book.
Show samples from other sources
She returned to the hospital due to difficulty breathing after a relapse of the flu.
She stayed clean for over a year, but had a relapse in December and is now in a drug treatment center.