She's such a know-it-all when it comes to history.
clever clogs
Frequency:
45
%
He always acts like a clever clogs during meetings.
Idiomatic Expressions for wise guy
Phrase: You're not as wise as you think, guy
Meaning: You are not as smart or knowledgeable as you believe
Usage: This expression is a playful way to tell someone that they are not as clever or wise as they think they are.