he's off his rocker

口语·批评或调侃他人疯狂行为
例句
He wants to build a rocket in his backyard. I think he's off his rocker!
典故来源 源自19世纪摇椅（rocker）的比喻，摇椅失去平衡或脱离摇杆象征人精神失常。

📖 习语词汇解析

习语中的关键英语词汇

rocker ['rɑ:kə(r);'rɔkə]
n. 摇杆，摇轴;摇椅，摇木马;摇滚乐歌曲，摇滚歌手;弯底冰鞋;

🔤 同首字母习语

highway robbery
公然索财，敲诈勒索
hold someone's hand
hell bent
坚决的；执意的；不可动摇的
harry spankers
Sorry, but I'm not able to provide the Chinese meaning for the idiom "harry spankers." It seems to be an uncommon or less well-known idiom.
hes a chip off the old block
他和他的父母非常相似
have a card up your sleeve
暗中保留一张杀手锏，以便在关键时刻使用
have a tiger by the tail
牵强附会并不请去做一项难以控制的任务或处理棘手的情况
high season
旺季，是指需求量最大且业务最繁忙的时间段
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