單憑猜測(或記憶);信口地;不假思索地
牛津電影裡 100%
just guessing or using your memory, without taking time to think carefully or check the facts
Well, this is just off the top of my head, but, uh...
I was just thinking off the top of my head.
釋義來自《牛津高階英漢雙解詞典》第 9 版