put your finger on

US /pʊt jʊər ˈfɪŋ.ɡər ɑːn/
UK /pʊt jʊər ˈfɪŋ.ɡər ɑːn/
"put your finger on" picture
1.

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.
•
The manager couldn't put his finger on why sales were declining.
:
burn your fingersfingerfingeringwork your fingers to the bonepull your finger output your oar input your foot in your mouth