Absent words - G

What is this?
Occasionally I had to translate from Serbian to English, and hit my head against several walls, as it happens to any translator. One of these were the words which are absolutely missing in English. In several cases I actually asked Anglophones for help, but didn't get much.The missing Serbian words are described to the best of my ability.
9-III-2008 - 25-II-2022 go home  
The word I can't translate
Description of a possible translation
gojiti se
to fatten (oneself)
but we never hear „I'm fattening“, it's always „I'm gaining weight“, which is not „gojiti se“, it's „dobijam na težini“.
grom
cloud-to-earth lightning