Plain English Meaning
The airplane hits the runway too hard or in the wrong attitude, springs back up into the air, and then has to land again.
Full Definition
A landing fault in which the airplane contacts the runway, rebounds back into the air, and must be re-landed. It is typically caused by touching down at an excessive descent rate, with too much airspeed, or in an improper pitch attitude, so that the landing gear's elastic energy and any residual lift propel the aircraft upward off the surface.
Context Anchor
Encountered during landing practice, especially in the last moments of landing when the airplane first contacts the runway.