1 a : a mass of air that moves very quickly and forcefully
She opened the door and felt a cold blast.
a blast of wind
b : a mass of water, gas, heat, etc., that moves very quickly and forcefully through the air
He was hit by a blast of water from the hose.
a blast of heat
2 : the loud sound made by a horn or a whistle
The driver gave a long blast on his horn.
the blast of the factory whistle
a bugle blast
3 : a powerful explosion
The bomb blast killed eight people.
a shotgun blast
4 : a sudden powerful force
She got a blast of reality when she returned to school in the fall.
a blast of criticism
5 informal : a very enjoyable and exciting experience
I had a blast at your party.
The wedding was a blast.