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relapse into [bad habit/state]
后常接 into，表示重新陷入某种不良状态
He relapsed into his old smoking habit.
复发旧习，重新陷入（不良习惯或状态）
复发；旧病复发
先理解核心含义，再看它在真实句子里的用法。
复发；旧病复发
The act of relapsing; a return of an illness after a period of improvement.
He relapsed into his old smoking habit.
复发旧习，重新陷入（不良习惯或状态）
复发或倒退的行为或状态。
The act or situation of relapsing.
人在好转一段时间后再次生病的状况。
An occasion when a person becomes ill again after a period of improvement
After months of healthy eating, she had a relapse and started eating junk food again.
在健康饮食几个月后，她故态复萌，又开始吃垃圾食品了。
The patient's relapse was unexpected, and the doctors had to adjust his treatment.
病人的复发出乎意料，医生不得不调整治疗方案。
He was proud of his sobriety, but a relapse made him feel guilty.
他为自己保持清醒而自豪，但一次复发让他感到内疚。
后常接 into，表示重新陷入某种不良状态
He relapsed into his old smoking habit.
复发旧习，重新陷入（不良习惯或状态）
名词搭配，指疾病或不良状态的复发
The patient suffered a relapse after leaving the hospital.
病情复发，旧病复发
常用名词短语，表示经历复发
She had a relapse of depression.
（疾病、症状等）复发
不及物用法，指行为或状态退步
After a month of sobriety, he relapsed.
复发，重蹈覆辙
Not this
He relapsed to his bad habits.
Use this
He relapsed into his bad habits.
误用介词：relapse后应接into，表示“重新陷入”，而非to。
Not this
He had relapse after treatment.
Use this
He had a relapse after treatment.
漏掉冠词：relapse作名词时可数，常用have a relapse，不可省略a。
Not this
The patient had a relaps.
Use this
The patient had a relapse.
拼写错误：relapse的正确拼写为re-l-a-p-s-e，不要漏掉末尾的e。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
复发
After months of recovery, he suffered a relapse.
复发
She had a relapse of her old illness.
复发风险
The patient is at high risk of relapse.
防止复发
Regular check-ups help prevent relapse.
导致复发
Stress can cause a relapse.
旧病复发；病情复发
He seemed to be recovering, but then he suffered a relapse.
他看上去在康复，但之后病情复发了。
重新陷入某种不良状态
After three years sober, she had a relapse into drinking.
戒酒三年后，她又重新开始喝酒了。
复发的风险
Regular checkups help lower the risk of relapse.
定期检查有助于降低复发的风险。
我来教你怎么把一小口酒变成一次复发。
In his song 'Swimming Pools (Drank)', Kendrick Lamar uses this line to caution that even a small drink can lead to a relapse.
在歌曲《Swimming Pools (Drank)》中，Kendrick Lamar 用这句歌词告诫人们，哪怕一小杯酒也可能导致旧病复发。
Use relapse naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
re（再）+ lapse（滑落）→ 病好转后又滑回病态，即“复发”。记住lapse是滑落、退步。
语域：mixed 常见场景：医疗场景：病历、医生与患者的交流、康复或戒断支持：谈论旧病复发 该词作名词时，在正式与日常语境中都会出现；比较常见于医疗、康复和成瘾戒断等话题。日常口语中虽也可用，但不像 get sick again 那样随意，因此这里标为混合语域，具体正式程度会随场景变化。
与 relapse 押韵：lapse、collapse、elapse（都含 -lapse），perhaps（/pəˈhæps/，拼写为 -haps）。traps（/træps/）也押韵。注意 release（/rɪˈliːs/）拼写略似，但读音完全不同。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY, WORDNET.