about face, to do an

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do an about-face

To suddenly and completely turn or change one's direction. This phrase can describe one's physical movement or a change in concept. She did an about-face and walked back up the steps once she saw that the subway wasn't running. Based on the reactions we got from test audiences, we need to do an about-face with the movie's plot.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

about face, to do an

To reverse a decision or change one’s opinion. The term comes from the American military command to turn 180 degrees at attention, dating from the mid-nineteenth century, and by 1900 was being used figuratively. A more recent colloquial usage is to do a 180, but it has not yet reached cliché status.
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The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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But he says the police officer super recognizers seem to have a disproportionate advantage over others for gleaning information about faces as they scan video images or watch people in motion.
She is combining cognitive psychology with techniques like brain imaging and electrophysiology to study how the brain processes information about faces. Her most recent research on the brain's face-processing mechanisms appears in the Journal of Neuroscience and Human Brain Mapping.
"Perhaps we're looking at how innate knowledge about faces changes over time due to visual experience," Pascalis says.
However, Quinn suspects that face recognition arises from babies' innate preferences for certain perceptual features, such as curved contours, rather than from more complex innate knowledge about faces, as other scientists suspect (SN: 7/7/01, p.
"These data point to the centrality of eye [contact] in learning about faces and establishing facial preferences in 2- and 3-month-olds," say Elliott M.