Also means
to increase
Usage Note
Engrosar primarily means to swell in size or to increase in number, as in engrosar las filas ('to swell the ranks'). It can also describe a physical thickening of a substance. The related adjective is grueso ('thick').
Examples
"Muchos voluntarios engrosaron las filas del partido."
Natural Translation
Many volunteers swelled the party's ranks.
Related Words
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