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

1.
menentukan dengan tepat, mengenal pasti
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.
Saya tahu ada sesuatu yang tidak kena, tetapi saya tidak dapat menentukannya dengan tepat.
•
The manager couldn't put his finger on why sales were declining.
Pengurus tidak dapat menentukan mengapa jualan menurun.