Break the ice -- Cool as a cucumber -- Diamond in the rough -- Eat crow -- Feather in your cap -- To fly by the seat of your pants -- A frog in my throat -- Go out on a limb -- Green thumb -- Her bark is worse than her bite -- High on the hog -- In a pickle -- Keep it under your hat -- Learning the ropes -- A leopard can't change its spots -- Let's get this show on the road -- Like it or lump it -- Make the grade -- More than meets the eye -- On the ball -- Out of the woods -- Pass the hat -- Play with fire -- Pull yourself up by your bootstraps -- Put your foot down -- Red-letter day -- Sight for sore eyes -- Spring chicken -- Take a backseat -- Tickled pink -- Two to tango -- When the cat's away...