Idiom: A group of words. When read separately, the words do not mean anything. But when read together, it tells you something that it, itself, does not tell you directly. "Show NOT Tell".
Lion's Share idiom: "Julian ate the lion's share of the pizza." In other words, "Julian ate a large portion of the pizza."
Thumb One's Nose idiom: "August was secretly thumbing his nose at him." In other words, "August was secretly laughing at him."
Hold Your Horses idiom: "Hold your horses Neo, let's get back to where you mentioned the murder." In other words, "Wait up Neo, let's get back to where you mentioned the murder."
Leave No Stone Unturned idiom: "Swear to me that you will leave no stone unturned to find the necklace." In other words, "Swear to me that you will search every corner and area to find the necklace." You use this idiom when you are trying to find something. Each "stone" could give you a clue of where the "something" is.
Break the Ice idiom: To do or say something to make someone feel relaxed or comfortable. Example: "At first, Mathew and Bob weren't good friends, however they broke the ice at the class party with food and drinks." In other words, "At first, Mathew and Bob weren't good friends, however they felt relaxed and comfortable at the class party with food and drinks."