side-by-side

• side by side
• SxS (abbreviation)

From side + by + side.

side-by-side (not comparable)

1. Adjacent; juxtaposed.

   Antonyms: end-to-end; tandem, in tandem

   Hyponyms: abreast; neck-and-neck

   • 2013 June 1, “Ideas coming down the track”, in The Economist, volume 407, number 8838, page 13 (Technology Quarterly):

     A “moving platform” scheme […] is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays.

• This hyphenated spelling is usually used before a noun it modifies, whereas the unhyphenated spelling is used after a noun it modifies.

English Wikipedia has an article on:

Side by Side (UTV)

Wikipedia

side-by-side (plural side-by-sides)

1. (automotive) A type of multipurpose off-highway utility vehicle, with four wheels, resembling a club cart or a golf cart
2. Synonym of double-barreled shotgun. Ellipsis of side-by-side shotgun.
3. Synonym of double rifle. Ellipsis of side-by-side rifle.
4. Ellipsis of side-by-side smoothbore rifle / side-by-side smooth-bore rifle / side-by-side smoothbore / side-by-side smooth bore. (a side-by-side "musket" (unrifled) longarm)