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

1.
de vinger leggen op, precies aanwijzen
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.
Ik weet dat er iets mis is, maar ik kan er mijn vinger er niet precies op leggen.
•
The manager couldn't put his finger on why sales were declining.
De manager kon er zijn vinger niet op leggen waarom de verkoop daalde.