1.VerbTo add something extra to something to make it appear more substantial.
"Some students pad out their essays by adding a whole lot of quotes from random sources.; Have you heard about girls padding out their bras to make their breasts look bigger?"
2.VerbTo sleep or go to bed.
"Because of my job I usually pad out just before nine o'clock.; My housemate was very annoyed to find my friends padded out on the lounge room floor this morning."