Bite the Hand That Feeds You

To act badly toward someone who has helped you

Mind-Blowing

Extremely impressive, surprising, or exciting

School of Dolphins

A group of dolphins swimming together

Don't Judge a Book by Its Cover

Do not judge something by its appearance alone

It Is Raining Cats and Dogs

It is raining very heavily

Cry over Spilt Milk

To be upset about something that has already happened and cannot be changed