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

hold someone accountable (for something)
hang fire
暂时搁置或延迟
hold someone's hand
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.
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 face like thunder
脸色阴沉，表情愤怒或生气
he's sitting on the fence
hum and haw
拖延、犹豫不决、含糊其辞
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