noun
1.
[ U , C ] the moment at which an aircraft leaves the ground and starts to fly :
The plane is ready for take-off.
take-off speed
( figurative )
The local economy is poised for take-off.
OPP landing
2.
[ C , U ] the moment when your feet leave the ground when you jump
3.
[ C ] if you do a take-off of sb, you copy the way they speak or behave, in a humorous way to entertain people