What does it mean by the idiom in bag?

The idiom "in the bag" means something is certain to happen, or a victory is already assured. It implies that something is already secured or guaranteed, like having a win in the bag.

Example:

* "The team has been practicing hard all season, so the championship is in the bag."

Origin:

The idiom originated in the 19th century, likely from the practice of putting money or valuables in a bag to keep them safe. Winning something would be like securing the money in a bag, making it certain.

Other related idioms:

* "In the bank": Similar meaning to "in the bag," implying something is certain.

* "A sure thing": Another way of saying something is guaranteed.

Let me know if you have any other idioms you'd like explained!