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go in

part of speech: phrase
definition 1: of information, to enter one's mind.
A lot of information goes in before the exam, but I forget most of it later.
definition 2: of a military or police unit, to enter a place in order to carry out some action.
The police went in to search the place.The Marines went in to clear the village.
definition 3: of the sun, to become obscured by clouds.
It was nice and warm out here until the sun went in.
definition 4: to join an alliance (usu. fol. by "with").
I decided to go in with them on their plan.After his brother went in with the group of investors, he went in too.