lift off phrasal verbphr v UPif an aircraft or spacecraft lifts off, it leaves the ground and rises into the air 〔飞机〕起飞；〔航天器 〕升空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 off at lift1(3)