"fattening" in the verb sense
1. fatten, fat, flesh out, fill out, plump, plump out, fatten out, fatten up
make fat or plump
"We will plump out that poor starving child"
"fattening" in the adjective sense
subject to or used in the process of finishing or fattening up for slaughter
"a fattening hog"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License