The term JOIN (WITH) can be broken down into five different crossword solutions: ALLY (4 letters), SIDE (4 letters), TIEO (4 letters), MEETUP (6 letters), and SIGNON (6 letters). The term JOIN (WITH) implies a connection between two or more people, objects, or ideas. ALLY is a person or group that is associated with another, often in support of a common cause. SIDE is a position, opinion, or attitude taken with regard to a particular issue. TIEO is an agreement or alliance between two or more parties. MEETUP is an arranged gathering of people with a common interest or purpose. Finally, SIGNON is the act of signing a document or agreement. All of these words are related to the concept of joining with someone or something, either through an agreement, alliance, or gathering.