This document defines idioms and provides examples of idioms related to happiness. Some common idioms about happiness included are "being on cloud nine" meaning to be very happy, "having a whale of a time" meaning to enjoy oneself greatly, "making someone's day" meaning to make someone feel happy, and "walking on air" or "being on top of the world" meaning to feel extremely happy. Further examples given are "being over the moon" meaning to be very pleased and "being in seventh heaven" meaning to be in a very happy state.