vn.
to thicken, to grow thick or large, to enlarge;
to become or grow larger, bigger, stouter, fatter;
to increase in size, to grow.
vn.
devenir gros, épais, grossir, se grossir, épaissir;
engraisser, prendre du corps, de l'embonpoint;
s'augmenter, s'accroître.