to do 1 braincell

To be in sync with somebody - when you do/say the same things at the same time

"..I got B on the test"

"Same here, but why are our answers almost the same? We sit at the opposite sides of the classroom??"

"..a carrot" "..a carrot"
"Can you two stop and try not to do 1 braincell with each other??"

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