not bat an eye

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Related to didn't bat an eye: bat an eyelid, didn't bat an eyelid, don't bat an eye

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.
See also: bat, eye, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

not bat an eye

mainly 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.
See also: bat, eye, not
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.
See also: bat, eye, not
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.
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References in periodicals archive ?
When NITL President John Ficker called a few months ago and ran his idea for the 2007 winner by me, I didn't bat an eye. 'We're going to give the award to the League itself this year,' Ficker said.
The show runs from March 27-31 at Sutton Coldfield Town Hall and at this late stage most production teams would panic - but choreographer Sarah Hickman didn't bat an eye. After all, this is nothing new.
At whom she stomped her good foot, but her mother didn't bat an eye. ...
"I didn't bat an eye. Just left to give a speech to a Tikkun conference," he said.
Her German colleagues, however, didn't bat an eye. "It made me wonder what kind of perks their journalists feel free to take," says Linn, who took a pass on the deal.