The term ONE CRYING FOUL is a phrase used to describe a situation in which one person is accusing another of wrongdoing. The crossword solutions for this term are REF, which stands for referee, and UMP, which stands for umpire. A referee or umpire is an official who is responsible for making sure that the rules of a game are followed and that fair play is maintained. In the context of the phrase ONE CRYING FOUL, the referee or umpire would be the one who is responsible for determining whether or not the accusation of wrongdoing is valid.