Idiom Definition:
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"to see stars"
to take a blow to the head that is hard enough that you see specks of light that resemble stars
or
to have your brain deprived of oxygen such that you see specks of light that resemble stars
Synonyms:
blackout, collapse, conk, dizziness, dizzy, insensible, flicker, gray-out, insensibility, knockout, stupor, swoon, trance, vertigo