see stars
to see flashes of light, especially because you have been hit on the head

[TahlilGaran] Dictionary of Contemporary English ▲

see stars
to seem to see bright flashes of light in front of your eyes.
Corky hit his head hard enough to see stars.

[TahlilGaran] English Idioms Dictionary ▲

see stars
to think that one is seeing stars as a result of being hit on the head
When I was hit by the opposing player I fell to the ground and began to see stars.

[TahlilGaran] English Idioms Dictionary ▲

see stars
{v. phr.}, {informal} To imagine you are seeing stars as a result of being hit on the head.
When Ted was hit on the head by the ball, he saw stars.

The boxer's head hit the floor, making him see stars.

[TahlilGaran] English Idioms Dictionary ▲