From Longman Dictionary of Contemporary Englishlift off phrasal verbUPif an aircraft or spacecraft lifts off, it leaves the ground and rises into the air → lift→ See Verb table
Examples from the Corpus
lift off• Thousands of people had gathered at Cape Canaveral to watch the rocket lift off.• There was a burst of flame as the rocket lifted off into the sky.lift-offˈlift-off noun [countable, uncountable] TTSthe moment when a vehicle that is about to travel in space leaves the ground → take-offExamples from the Corpus
lift-off• Lift-off is set for 10:55 a.m.• I did a quick equipment check, like an astronaut preparing for lift-off. 