Meaning of the word "not bat an eye" in English

What does "not bat an eye" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

not bat an eye

US /nɑt bæt ən aɪ/
UK /nɑt bæt ən aɪ/
"not bat an eye" picture

Idiom

1.

to show no surprise or concern when something unusual or shocking happens

Example:
When she heard the bad news, she didn't bat an eye.
He told them he was quitting, and they didn't bat an eye.
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