to go in

to go forward; to advance; to go in; to enter; to put in; to submit; to take in; to admit; (math.) base of a number system; classifier for sections in a building or residential compound

(of a process etc) to proceed; to be in progress; to be underway; (of people) to carry out; to conduct (an investigation or discussion etc); (of an army etc) to be on the march; to advance

to enter; to join; to go into

to make headway; to make progress