1 If a fashion or product comes in, it becomes available or popular: --
Flared trousers first came in during the 1970s.
2 to be useful for a particular purpose: --
3 When news or information comes in, it is received: --
5 to finish a race in first, second, etc. position --
He came in with four shopping bags and dumped them on the table.
Simon was so absorbed in his book, he didn't even notice me come in.