English Dictionary

off the top of one's head

前置詞句

慣用表現

Used other than figuratively or idiomatically: see off, top, head. / (idiomatic) In an extemporaneous manner; without careful thought, preparation, or investigation.

日本語の意味

即席で、即興に行う様子。あまり深く考えず、準備や調査を行わずに行動すること。 / 思いつきで、直感的に行うこと。

To remove the helmet, the nurse lifted it gently and slid it off the top of one's head.

ヘルメットを外すために、看護師はそれを優しく持ち上げて人の頭のてっぺんから滑らせた。

意味（1）

Used other than figuratively or idiomatically: see off, top, head.

意味（2）

(idiomatic) In an extemporaneous manner; without careful thought, preparation, or investigation.

I cannot think of any good examples off the top of my head, but give me a couple of hours and I'm sure I could come up with something.