"Leaps and bounds" is an idiom used to describe a sudden and significant change, advancement, or progress. It can also be used to indicate that something is happening at an unexpectedly fast pace.

The idiom "couch potato" refers to someone who spends a lot of time sitting on the couch or lying down in a similar position, usually watching television or engaging in other leisure activities that require little physical activity.

The idiom "zero hour" refers to a situation or time when an important event is about to happen, occur, or take place. It suggests that there is no more time left to do something before the moment of truth or judgment arrives.

The idiom "class clown" refers to someone who is always the center of attention, often due to their humor, but also because they are perceived as outgoing and friendly. They often have a talent for making people laugh and can brighten up a dull class.

"Heavy heart" is an idiom that means feeling sad or disappointed about something. It can also mean carrying a heavy burden or responsibility. The phrase can be used to describe a sense of weight and emotional heaviness.