off the top of your head
不加思考,直接回答或提出看法
口語·臨時回答或猜測
英文釋義
to give or provide an answer or response quickly, without taking the time to think or research
例句
I can't tell you the exact number off the top of my head, but I think it's around 50.
典故來源
源自20世紀早期,指信息像從頭頂直接冒出一樣,未經大腦深思熟慮。