An amphipod, Hyalella azteca, indigenous to the Everglades.

(idiomatic) To ally oneself with a given opinion, agenda or group; to support one side or viewpoint in a competition or confrontation.

The reverse side of a cassette tape or a phonograph record, especially a vinyl single, often containing songs not considered for airplay.

(slang, Britain, New Zealand, Australia) A secondary lover, a mistress.

(baseball) To get the third out of an inning.

Having two sides, bilateral. / Reversible. / (algebra) Whose salient properties apply when (the specified object) appears on either side of a given binary operator.

Alternative spelling of sidelobe

The uppermost side of anything

plural of upper side

(video games) A video game where the player views the world from the side, controlling a character who mostly travels horizontally (usually left to right) through a level.