Reverse Dictionary: SIDE BY SIDE

ADJECTIVES
LATERAL existing or moving side by side → c1611 obs.

ADVERBS
BIRD-AND-JOE side by side, cheek-by-jowl, like Darby and Joan → Bk1911 Sc. 
SIDE AND SIDE side by side; abreast; close together → 1834 Amer. dial.
SIDE BY EACH side by side → 1923 Amer. dial.

VERBS
IMPALE to place side by side for comparison, or as being equal in dignity → 1647 obs.