The idiom "apple of discord" refers to a person or thing that causes conflict or disagreement among people. It can also mean something that is controversial or divisive, causing people to have opposing opinions or take sides.

The idiom "zip it" is used to tell someone to be quiet or to shut up. It can also mean to close one's mouth or to stop talking. This phrase can also be used as a way of saying "okay" or "fine.

"And so on" is an idiom that means to continue or repeat something, often in a general sense or without specifying the details. It is commonly used when listing items or describing a process that involves multiple steps.

The "ugly duckling" is an idiom that refers to someone who appears to be unattractive or unpleasant, but turns out to be more attractive than expected. It is often used to describe a person's initial appearance or behavior.

A "ballpark figure" is an approximate or rough estimate of something, typically given without precise measurements or calculations.