can’t put my finger on it

(idiom) can’t figure out or understand something

Example Sentences:

A: Something is different about you, but I can’t put my finger on it.
B: I got a haircut.
A: That’s it! You look fabulous!

The rice tasted different, but I couldn’t put my finger on why. Then I realized that I forgot to add the salt!

Media:

Similar idioms:

1. figure out
2. doesn’t lift a finger
3. rub salt into the wound