Memory Idioms 2Version en ligne Players will try to match the idiom with it's meaning. par Lunarn Smith Once in a blue moon Tell a secret Good idea or invention Let the cat out of the bag It’s not rocket science Can’t stay calm (relax) because you’re nervous Wait and be patient Work until late at night Don’t start problems or cause trouble Best thing since sliced bread Burn the midnight oil Hold your horses Cost an arm and a leg Happens very rarely; uncommon It’s not hard. Ants in one’s pants Very expensive Let sleeping dogs lie