Meaning of the word "every man has a fool in his sleeve" in English

What does "every man has a fool in his sleeve" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

every man has a fool in his sleeve

US /ˈev.ri mæn hæz ə fuːl ɪn hɪz sliːv/
UK /ˈev.ri mæn hæz ə fuːl ɪn hɪz sliːv/
"every man has a fool in his sleeve" picture

Idiom

everyone, no matter how wise or clever, is capable of making mistakes or acting foolishly at times

Example:
Even the most brilliant scientist can make a silly error; every man has a fool in his sleeve.
I can't believe I fell for that scam, but I guess every man has a fool in his sleeve.