put (one's) finger on

Translations
точно определить
I can't quite put my finger on why this painting is so captivating.
Я не могу точно определить, почему эта картина так завораживает.
Definitions
To identify or understand something precisely, especially when it is difficult to articulate or recognize.
Words
put

verb
положить
one

article or possessive pronoun
свой
s
притяжательная форма
finger

noun
палец
on

preposition
на