Also means
enlarge, grow
Usage Note
Grossir is used both for a person gaining weight and for any object or quantity that grows larger — a river grossit when it floods, a crowd grossit as more people arrive. In optics, grossir also means to magnify. The opposite is maigrir ('to lose weight').
Examples
"Il a grossi de cinq kilos cet hiver."
Natural Translation
He gained five kilos this winter.

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