1 If a fashion or a product comes in, it becomes available or becomes popular. -- входить в моду
Flared trousers came in during the seventies.
2 If news, information, a report, etc comes in, it is received. -- поступать (о новостях и т. д.)
News is just coming in about the explosion.
3 to finish a race or a competition in first/second, etc position -- приходить к финишу первым/вторым и т. д.
4 If the tide (= regular change in the level of the sea) comes in, the sea moves towards the beach or coast. -- наступать (о приливе)
5 used to describe how someone is involved in a situation, story, or plan -- входить в дело, подключаться