not bat an eye
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not bat an eye
To not display even a hint of an emotional response, such as consternation, annoyance, sadness, joy, etc. 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
not bat an eyemainly AMERICAN
If someone does not bat an eye when something happens, they do not appear at all shocked or surprised by it. She never batted an eye when I told her I was leaving my job. These people don't bat an eye when they're charged 16 dollars a pound for cheese. Note: You can also say that someone does something without batting an eye. He handed over the money without batting an eye. Note: The usual British expression is not bat an eyelid. Note: Bat is from a French word meaning to beat or flutter and is used of a bird's wings. The idea is that people who do not blink a lot in a given situation appear calm rather than nervous or surprised.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
not bat an eye/eyelash Informal
To show no emotion; appear unaffected: The reporter didn't bat an eyelash while reading the gruesome news.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.