故态复萌: return to one's old habits; resume one's former manner; revert to one's old way of life; play one's old tricks again; relapse into error; go [slip] back to [into] one's old way of doing th
旧病复发: have a recurrence of an old illness; an old disease again comes back.; be a recurrence of an old complaint; fall into one's bad old ways again; (the patient) has had a relapse.; have an at
