Moving horizontally, from one side to another and back.

plural of side-by-side

(automotive) A type of multipurpose off-highway utility vehicle, with four wheels, resembling a club cart or a golf cart / Synonym of double-barreled shotgun. Ellipsis of side-by-side shotgun.

Alternative spelling of side-by-side

Alternative spelling of side-by-side

Alternative spelling of side-to-side

Adjacent.

(literally) Beside or alongside one another; close to one another and abreast. / (figuratively) In peace. / (figuratively) With a common purpose.

(rugby) Called by the referee at the end of a match, as no side has the next possession of the ball.

Forms adjectives describing position next to or alongside an object. / Forms adjectives and adverbs describing position in relation to a dividing line or other separation.