put your finger on
US /pʊt jʊər ˈfɪŋ.ɡər ɑːn/
UK /pʊt jʊər ˈfɪŋ.ɡər ɑːn/

1.
正確に特定する, はっきりさせる
to identify exactly what is wrong or what has caused a problem
:
•
I know something is wrong, but I can't quite put my finger on it.
何かがおかしいのはわかるけど、それが何なのか正確には特定できない。
•
The manager couldn't put his finger on why sales were declining.
マネージャーは売上が減少している理由を特定できなかった。