not bat an eyelid

idiom

Definition of not bat an eyelid

British, informal
: to show no surprise, fear, concern, etc. : not bat an eye

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“Not bat an eyelid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20bat%20an%20eyelid. Accessed 28 Feb. 2021.

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