Wiktionary
vb. To reduce one's weight; to become thinner.
WordNet
v. take off weight [syn: reduce, melt off, lose weight, slim, slenderize, thin] [ant: gain]
Usage examples of "slim down".
Elijigbo brought a chair out to stage center and the men sat Slim down on it.
She couldn't bear to even walk past the stone - even if she did slim down enough to get through the lichgate.
Down there, far below, where the buttocks of the world slim down again, if you go far south enough you reach again the realm of perpetual cold that begins and ends our experience of this earth, those ranges of ice mountains where the bull-roaring winds bay and bellow and no people are, only the stately penguin in his frock coat not unlike yours, Daddy, the estimable but, unlike you, uxorious penguin who balances the precious egg on his feet while his dear wife goes out and has as good a time as the Antarctic may afford.
Eddy Merckx had been telling me to slim down for years, and now I understood why.
About Minnie Fairchild: since Sugar Baby's death she seems to be drinking more than she used to, drinking and hiding the beer bottles like she's ashamed, surely she is ashamed, and she's gaining weight so she's now quite a stout lady and her old nice clothes don't fit but she doesn't want to get new nice clothes, reasoning that she'll slim down some and won't have any use for the new large size clothes so in the mean time she's wearing old baggy slacks and blouses and sweaters and tent-like dresses one or another of her neighbor friends have given her.