A diamond in the rough 1A drop in the bucket 2A frog in one’s throat 3A piece of cake 4A shot in the dark 5Achilles’ heel 6An arm and a leg 7An eye for an eye 8Apple of your eye 9Armed to the teeth 10As cool as a cucumber 11At the drop the a hat 12At the eleventh hour 13Back to square one 14Backseat driver 15……Under the gun 169Under the weather 170Under your nose 171Up against the wall 172Upper crust 173Watched pot never boils 174Wear heart on sleeve 175Wet behind the ears 176When pigs fly 177When the chips are down 178Whistle in the dark 179Word of mouth 180You are what you eat 181