I 1. paired, matched exactly.
2. inseparable, intimate.

II 1. to put [in], to add [to], to admix [into], to mix in, to put together.
2. «MAT» to add.
3. to contribute.
4. to invest, to deposit (money), to chip in.
5. to add (to a conversation).
6. to hitch up (to a vehicle).
7. to compose (songs, ballads).
8. to appoint [to], to make [someone] join, to associate [to], to entrust [with], to involve [in].
9. to unite [to], to wed to (husband and wife).