Opposing Side is a term used to refer to the opposition or adversary in any situation. The term can be broken down into three words: ANTIS (5 letters), FOE (3 letters), and ENEMY (5 letters). ANTIS is derived from the Greek word 'ANTITHESIS' which means 'OPPOSITE'. FOE is an old English word meaning 'ENEMY'. ENEMY is derived from the Latin word 'inimicus' which means 'HOSTILE'. All three words are used to describe someone or something that is opposed to another person or thing.