The term 'GO IN' can be solved in two ways in a crossword puzzle. The first solution is 'ENTER' which is a 5 letter word. This verb means to come or go into a place, especially one that is enclosed or hidden. The second solution is 'COMEIN' which is a 6 letter word. This verb is similar to ENTER but it implies movement towards the speaker or writer. Both words are used to describe the action of entering a place.