1.
when the tide comes in , it moves towards the land
OPP go out
2.
to finish a race in a particular position :
My horse came in last.
3.
to become fashionable :
Long hair for men came in in the sixties.
SYN go out
4.
to become available :
We're still waiting for copies of the book to come in.
5.
to have a part in sth :
I understand the plan perfectly, but I can't see where I come in.
6.
to arrive somewhere; to be received :
The train is coming in now.
News is coming in of a serious plane crash in France.
She has over a thousand pounds a month coming in from her investments.
7.
to take part in a discussion :
Would you like to come in at this point, Susan?
8.
( of a law or rule ) to be introduced; to begin to be used