The side of a tire. / The wall forming the side of a structure; a side wall. / The wall forming the side of a racquetball court.

(construction) A passer-by or other person who watches and possibly advises work at a construction project from a sidewalk or other vantage point.

A species of flying squirrel (Pteromys volans), common in Siberia and northeastern Europe.

A room to be used by someone who is ill.

A blow with the side of something, such as the side of car that is changing lanes incautiously. / A catty or sarcastic remark.

(transitive) To give a blow with the side, as to strike with the side of a car when turning.

A bed used by a person who is sick. / A place for convalescence.

(medicine) Early morning nausea and vomiting as a symptom of pregnancy.

A light found at the side of something; especially of a vehicle. / A window found at one or both sides of a door. / A piece of incidental information that helps one understand a subject.

(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.