불다

For a wind to form and move in a certain direction.

For a vogue, trend, change, etc., to take place and spread.

To use the mouth to blow or create wind.

To put the lips close to each other and make a sound by exhaling between them.

To let out a breath hard through the nose.

To put a wind instrument to the mouth and exhale to make a sound.

(slang) To say what one has been hiding.