Verb
grossen (third-person singular simple present grossens, present participle grossening, simple past and past participle grossened)
(transitive, intransitive) To make or become gross (all senses)
In addition to the Hillcrest Youth of the Month awards, Sandy students Kiara Vargas and Britton Grossen, of Alta High School; and Sydney Jensen and Alex Schneider, of Jordan High School, received this honor. Source: Internet