[問題]英文會話: I couldn't put my finger on it

[JasonPlus (天氣太熱了)]

What does this actually mean?
I heard it quite often on TV, goes like ...


This guy seems like a very promising one, but I couldn't put my finger on him...

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◆ From: 137.132.196.124
※ 編輯: JasonPlus       來自: 137.132.196.124      (11/01 02:51)
推 blackcake:put one's figer on means I know his name
推 JasonPlus:but..then the sentence doesnot make sense...?