ˌhalfway ˈhouse noun

1. [singular] British English something which is a combination of the qualities of two different things:
Belief is a kind of halfway house between non-belief and absolute proof.

2. [countable] a place for former prisoners or people who have had problems such as mental illness, where they can live until they are ready to live on their own

[TahlilGaran] Dictionary of Contemporary English ▲

a halfway house
something which combines the qualities of two different things, often something which is not as good as either of those things on their own.
It's sort of a halfway house between classical music and pop.
(often + between)

[TahlilGaran] English Idioms Dictionary ▲