Meaning of “not bat an eyelid” in the English Dictionary

british dictionary

"not bat an eyelid" in British English

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not bat an eyelid

UK US not bat an eye/eyelash

to show no sign of surprise or worry when something unexpected happens:

She told him she'd spent all her savings but he didn't bat an eyelid.

(Definition of “not bat an eyelid” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)