- That causes weight gain; often of high calorie food with relatively little nutritive value.
"I'd really love to lose weight, the trouble is, tasty deserts with stuff like whipped cream are so fattening."
- The act of becoming fatter.
- The act of making something fatter, particularly in reference or allusion to livestock.
- present participle of fatten
"1997, J.K. Rowling, Harry Potter and the Philosopher's Stone, iv: ‘Yer great puddin’ of a son don’ need fattenin’ any more, Dursley, don’ worry.’"