"Not the brightest star in the sky" means there not the smartest person.
Let's say you where in a class room and you failed a test, sombody might say well "there not the brightest star in the sky"
Did you hear that Kim failed her exams?
Well she's not the brightest star in the sky if I'm being honest.
by Xo_Xo_Xo December 30, 2020
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