Synonyms of side by side in English:

side by side


See definition of side by side

phrase

1‘they cycled along side by side’

SYNONYMS
alongside, alongside each other, beside each other, abreast, level, shoulder to shoulder, cheek by jowl, together, close together

2‘most transactions proceed side by side’

SYNONYMS
at the same time, at one and the same time, at the same instant, at the same moment, simultaneously, contemporaneously
together, all together, as a group
ANTONYMS

in line