The original fifteenth century meaning of windbag was "bellows for an organ," which was literally a bag of wind or air. By the early 1800s, it took on the metaphorical meaning of "person who talks too much."

What does the word windbag mean?

: an exhaustively talkative person. Synonyms Example Sentences Learn More About windbag.

What is a windbag in weather?

The surrounding high-pressure air rushes in to fill in the low-pressure area you created ("winds will blow from high to low"). As a result, a large quantity of air from the atmosphere is drawn into the bag at the same time as you blow into the bag.