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