Blast-off is the moment when a rocket launches into the sky, shooting up from the launch pad in a huge burst of fire, smoke, and thunder. The engines ignite with tremendous force, and the rocket lifts off the ground and climbs toward space. Mission control counts down: “Three, two, one, blast-off!”

The word captures that explosive instant when a spacecraft breaks free from Earth's gravity. At blast-off, rockets burn thousands of gallons of fuel per second, creating enough power to lift tons of metal, equipment, and astronauts. The ground shakes, flames shoot downward, and the rocket accelerates upward at incredible speed.

People also use blast off to describe anything that starts with sudden energy or excitement. A runner might blast off from the starting line, or a party might blast off when everyone arrives at once. If your little brother races out of the house when the ice cream truck arrives, he's blasting off toward that chocolate cone. The phrase always suggests speed, power, and dramatic action, just like those rockets climbing toward the stars.