Dictionary

A building material which covers and protects the sides of a house or other building.

Example: Ugh. If there's one thing I can't stand it's cheesy vinyl siding.

To ally oneself, be in an alliance, usually with "with" or rarely "in with"

Example: Which will you side with, good or evil?

To lean on one side.

To be or stand at the side of; to be on the side toward.

To suit; to pair; to match.

To clear, tidy or sort.

A second, relatively short length of track just to the side of a railroad track, joined to the main track by switches at one or both ends, used either for loading or unloading freight, storing trains or other rail vehicles; or to allow two trains on a same track to meet (opposite directions) or pass (same direction) (the latter sense is probably an American definition).