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plural liftoffs
(aerospace) The point in the launch of a rocket or an aircraft where it leaves contact with the ground. examples
The point at which a person or animal leaves the ground, as for example when jumping. quotations examples
As she was on her approach to the hoop, taking that first Jordanesque liftoff step, her mouth guard fell floorward. Undeterred, she kept going up with the ball in her right hand.
2011, Robert Strauss, Daddy's Little Goalie, page 53