Flash somebody a smile, look, etc.
Definition 1 of 2

Brief Moment
The phrase implies a quick, spontaneous action, not lasting long.

He flashed her a smile as their eyes met.
Nonverbal Communication
Used to convey feelings without words, often in passing.

She flashed a warning look, silencing her brother.
Positive Emphasis
Often used to suggest a positive or friendly gesture.

Upon winning the award, he flashed the crowd a joyful grin.
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