cap over the windmill

Adverb

idiomatic not-comparable

(idiomatic) in a bizarre or eccentric manner

Japanese Meaning

奇妙で風変わりな方法で / 異様な振る舞いで / 突拍子もなく型破りな様子で

During the rehearsal, Maria sang cap over the windmill, leaving the director bewildered.

リハーサル中、マリアは風変わりに歌い、監督を困惑させた。

Sense（1）

(idiomatic) in a bizarre or eccentric manner