flash a smile

flash (one) a smile

To smile at one, usually quickly and perhaps unexpectedly. She was sad this morning, but I think she's feeling better now—she flashed me a smile before she left.
See also: flash, smile
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

flash a smile (at someone)

Fig. to smile quickly and perhaps briefly at someone. She flashed a smile at me as if she recognized me.
See also: flash, smile
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Here's a new way to flash a smile: Waft a glowing plasma of charged particles onto your teeth.
Pretend you just noticed him right before you reach him, then catch his gaze and flash a smile as you pass.