put your finger on

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

poner el dedo en, identificar con precisión

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.
Sé que algo anda mal, pero no puedo identificarlo exactamente.
The manager couldn't put his finger on why sales were declining.
El gerente no pudo identificar por qué las ventas estaban disminuyendo.