side by side side by side /saɪd baɪ saɪd/

adjective

1. () Nearest in space or position; immediately adjoining without intervening space  ( side by side , adjacent , next )
   nearest in space or position; immediately adjoining without intervening space
    Had adjacent rooms
   had adjacent rooms
    In the next room
   in the next room
    The person sitting next to me
   the person sitting next to me
    Our rooms were side by side
   our rooms were side by side
   
2. Closely related or associated  ( side by side )
   closely related or associated
    A city in which communism and democracy had to live side by side
   a city in which communism and democracy had to live side by side