side-by-side
adjectiveUK /ˌsaɪd baɪ ˈsaɪd/
US /ˌsaɪd baɪ ˈsaɪd/
Two things that are next to each other.
The two friends sat side-by-side on the bench.
OTHER MEANINGS
2. Done by two or more people working together.
They did a side-by-side comparison of the two cars.
3. Placed close together for comparing.
The museum showed the paintings side-by-side.
4. Moving or existing at the same time next to each other.
The bikes rode side-by-side down the path.