Pulling a fast one on someone' is an idiom that means to deceive or trick someone. It is usually done in a clever way, and the person being tricked may not even realize it until it is too late. The crossword solutions for this term are BILK (4 letters), FOOL (4 letters), HOODWINK (8 letters), SCAM (4 letters), CON (3 letters), and DUPE (4 letters). All of these words can be used to describe the act of deceiving someone. BILK means to cheat someone out of money, FOOL means to trick someone, HOODWINK means to deceive someone, SCAM means to swindle someone, CON means to trick someone, and DUPE means to deceive someone.