Express agreement is a term used to describe the act of agreeing with something. The three crossword solutions for this term are ASSENT (6 letters), NOD (3 letters), and SAYYES (6 letters). ASSENT is an act of expressing agreement, often done verbally. NOD is a gesture made by moving the head up and down to indicate agreement or understanding. SAYYES is a phrase used to express agreement, usually said out loud.