fat·ten 
/ˈfætn̩/ verb
fat·tens; fat·tened; fat·ten·ing /ˈfætn̩/ verb /ˈfætnɪŋ/ 1 [+ obj] : to make (someone or something) fat
▪ fatten (up) pigs for slaughter 2 [no obj] : to become fat — usually + up ▪ Bears need to fatten up for the winter.
▪ fatten (up) pigs for slaughter
— fattening adjective [more fattening; most fattening]
▪ Sauces made with cream are very fattening. [=they are very likely to make people fat] ▪ I'm trying to avoid fattening foods.
▪ Sauces made with cream are very fattening. [=they are very likely to make people fat] ▪ I'm trying to avoid fattening foods.
