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

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.