Meaning of the word "behind someone's back" in English

What does "behind someone's back" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

behind someone's back

US /bɪˈhaɪnd ˈsʌm.wʌnz bæk/
UK /bɪˈhaɪnd ˈsʌm.wʌnz bæk/
"behind someone's back" picture

Idiom

1.

without someone's knowledge or without telling them

Example:
I can't believe she talked about me behind my back.
They made the decision behind his back.
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