0 used to refer to the largest size of meal or drink available in a fast food restaurant
1 to give a customer in a fast food restaurant the largest size of meal or drink:
2 → supersized
4 to serve the largest size or quantity of food or drink that is available in a fast food restaurant:
Fast-food outlets are being discouraged from supersizing their portions.
The vehicle boasts a supersize panoramic glass roof and theater-style seating, with rear passengers sitting a little higher than those in front.
Everything is mega meal, supersize.