The term 'side (with)' can be broken down into five crossword solutions: AGREE (5 letters), ABUT (4 letters), ALLY (4 letters), ALIGN (5 letters), and FAVOR (5 letters). AGREE means to accept or concur with a point of view, while ABUT means to border or adjoin. ALLY is a noun that refers to a person, group, or nation that is associated with another, usually for mutual benefit. ALIGN means to arrange in a line or bring into agreement, and FAVOR is an act of kindness beyond what is due or usual.