BE A SPORT is an expression used to encourage someone to be brave and take a risk. The crossword solutions for this term are POLO (4 letters), CMON (4 letters), and TREAT (5 letters). POLO is a sport that involves two teams of players riding on horseback and hitting a ball with a long-handled mallet. CMON is an abbreviation for 'Come On, ' which is an expression used to urge someone to do something. TREAT is an action that involves showing kindness or generosity to someone.