Expressing approval is a way of showing agreement or support for something. The term 'express approval' can be broken down into four crossword solutions: ACCEDE (6 letters), APPLAUD (7 letters), NOD (3 letters), and CLAP (4 letters). ACCEDE means to agree to a request or demand, APPLAUD means to show approval or praise by clapping, NOD means to move the head up and down to indicate agreement or understanding, and CLAP means to hit the palms of the hands together to show approval or appreciation.