The idiom "green thumb" refers to a person who has a natural talent for gardening or growing plants. It implies that the individual has a good understanding of how to care for and nurture plant life, and is able to achieve success with minimal effort.

The idiom "on the back burner" refers to something that is being put aside or held back for later, often because it is not currently a priority or it is still being considered or debated.

The idiom "bun in the oven" is a colloquial expression used to describe a woman who is pregnant. The phrase likely originated from the image of a woman's belly resembling a bun, or a loaf of bread, due to the swelling caused by pregnancy.

The idiom "card up sleeve" refers to a secret plan or strategy that is hidden from others, often used to deceive or mislead someone. The phrase comes from the traditional sleight-of-hand trick of hiding a card up one's sleeve, which makes it difficult for others to see what you are doing.

The idiom "off the hook" is used to describe something that is out of control, unpredictable, or wild. It can also be used to describe something that is exceptional, excellent, or top-notch.