Separate is a verb meaning to divide or disconnect something from something else.
It can also be used as an adjective meaning existing or happening independently or not connected.
Common collocations:
1. Separate ways - go in different directions
2. Separate the wheat from the chaff - distinguish valuable things from worthless ones
3. Separate but equal - a legal doctrine in U.S. history
4. Separate account - a type of investment account