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

1.
положить палец на, точно определить
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.
Я знаю, что что-то не так, но не могу точно определить, что именно.
•
The manager couldn't put his finger on why sales were declining.
Менеджер не мог определить, почему продажи падали.