relapse

故态复萌；旧病复发；再度堕落；再陷邪道英释中释vto become ill again after you have seemed to improve

复发，再发；故态复萌；回复原状英释中释nwhen someone becomes ill again after having seemed to improve

1 relapse into,复发；堕落为

1 "I wish I did," said Phil Jordan, relapsing into his usual gloom..“我要是做了就好了，”菲尔•乔丹说着，回到平时的忧郁中。