This document defines several common idioms and phrases: "to have a monkey on your back" means to have an addiction, especially to drugs; "it's raining cats and dogs" refers to very heavy rain; "a big fish in a small pond" describes an important person in a small organization; "the green-eyed monster" refers to jealousy; "rat race" denotes a competitive struggle; and "pull a rabbit out of the hat" means to unexpectedly solve a problem through clever means.