Meaning of “combine” - Learner’s Dictionary

combine

verb us uk /kəmˈbaɪn/
For the sake of convenience, they combined the two departments.These two normally harmless substances combine to form a poisonous gas.They've managed to combine old and new very stylishly.None of us has much money so let's combine what we've got.Combine the dry ingredients and put to one side.
JOIN TOGETHER [ I, T ]

B2 to become mixed or joined, or to mix or join things together:

My wages combined with your savings should just pay for it.
The band combines jazz rhythms and romantic lyrics.
DO BOTH [ T ]

to do two or more activities at the same time:

I don't know how she combines / working with studying.

(Definition of “combine” from the Cambridge Learner’s Dictionary © Cambridge University Press)