not bat an eyelid Meaning in the Cambridge English Dictionary
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Meaning of “not bat an eyelid” in the English 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 ​unexpectedhappens: 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)
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