adjective
Definition: Relating to or located at the side of something; not the main part but an additional or supplementary aspect.
Example: She took a side road to avoid the traffic on the main highway.
noun
Definition: A part or surface of something that is not the front or back, often referring to the edges or aspects of an object or area.
Example: She placed the box on its side to make it easier to open.
transitive verb
Definition: To support or agree with someone or something, or to place something next to another object.
Example: She decided to side with her friend during the debate.