"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
1. fattening
subject to or used in the process of finishing or fattening up for slaughter
"a fattening hog"
"fattening pens"
Source: WordNet® (An amazing lexical database of English)
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