Put your foot in your mouth: To say something foolish, embarrassing, or inappropriate.

Example 1: I really put my foot in my mouth when I asked her how her husband was. I forgot that he died last year.

Example 2: Every time he speaks he puts his foot in his mouth.

“Apple of your eye” is the person who you love most. 🍎

Example 1: Harry was his first child and the apple of his eye.
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Example 2: He said that Kelly was the apple of his eye. He could not imagine living without her.

Take it or leave it: Take this one or none, there are no other choices.

”Behind the eight ball” means “in a weak or losing position.”

Example 1: The young basketball player was behind the eight ball because he was the smallest member of his team.⠀

Example 2: John is behind the eight ball because he started writing his term paper far too late.

The idiom ”Gray matter” means “intelligence, ‘brains’.”

Example 1: Ted keeps making mistakes in his job. I don’t think he has a lot of gray matter.⠀

Example 2: Use your gray matter and think how to solve this problem.

The idiom “Nest egg“ means“ An amount of money saved for the future.“

Example 1: Son, we worked hard for many years to build up a nest egg and we’ve decided to spend it on your university education.
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Example 2: Start investing early and invest regularly in order to build a nest egg for the future.

The idiom “Monkey business“ means “silly or dishonest behavior.“ ⠀

Example 1: Our teacher warned us not to try any monkey business while she was out of the room.⠀

Example 2: I want to sleep. Stop disturbing me by your monkey business.

“A little bird told me” means “I was told by a private or secret source.”

Example: A little bird told me that John is not going to get that promotion.

The idiom ”Acid test” means “something that shows the true worth or value of something or someone.”

Origin: from the testing of gold with nitric acid. First recorded in 1890–95.⠀

Example 1: The new party is doing better and better in the polls, but the acid test will be the next election.⠀

Example 2: They’ve always been good friends, but the acid test will come when they have to share a flat.

The idiom ”Through thick and thin” means “through good times and bad times.”

Example 1: We’ve been together through thick and thin, and we won’t leave each other now.⠀

Example 2: My husband has supported Liverpool through thick and thin. He is a true fan.

The idiom ”Up a tree” means “in a difficult situation.”

Example 1: I have no idea how I’m going to get out of this contract - I’m really up a tree now.⠀

Example 2: The student was up a tree when she realized that her final exam was tomorrow, and she hadn’t studied for it at all.