Getting Warmer

When someone is playing a guessing game, the person asking the question might say, "You're getting warmer." This means, a guess is getting closer and closer to the answer.

Example: Paul: "Guess how many pennies I'm holding."
Jason: "Uh... five."
Paul: "Wrong."
Jason: "Uhhh, okay. Nine."
Paul: "Getting warmer."
Jason: "Eleven!"
Paul: "Still warm."
Jason: "Ten?"
Paul: "Yes, I'm holding ten pennies."

This type of idiom is used for other kinds of "games" as well.

Conversely, "getting colder" means getting further away from the correct answer.