bat an eye

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bat an eye

To display a subtle emotional reaction, such as consternation, annoyance, sadness, joy, etc. Generally used in the negative to denote that the person in question did not display even a hint of an emotional response. Mary didn't even bat an eye when I told her I was moving out. That guy is dangerous. I heard he killed a man without batting an eye.
See also: bat, eye

not bat an eye/eyelash/eyelid

to not show any shock or surprise 'So what did she say when you told her you were leaving?' 'She didn't bat an eyelid.'
See also: bat, eye