Definition of side:

part of speech: verb

To embrace the opinions of one party in opposition to another.

part of speech: adjective

Towards the side; lateral.

part of speech: noun

The part of a body lying between the extremity of the front and back throughout its entire length; the margin; edge; border; quarter; region; party; sect; branch of a family; any part or position viewed as opposite, or as contrasted with another; used to denote consanguinity, as, by the mother's side.