Where does “grzybing” come from?

grzybing (Polish) comes from Polish -ing, from English -ing, from Middle English -ynge, from Old English -ung, from Proto-Germanic -ungō — -ing, -ion. "Forms gerund nouns from verbs.".

grzybing (Polish): mushrooming, mushroom picking

Definitions

mushrooming, mushroom picking

Ancestry of “grzybing”, step by step

Step	Language	Word	Meaning
1	Polish	-ing	—
2	English	-ing	Used to form gerunds, a type of verbal nouns,...
3	Middle English	-ynge	Alternative form of -ing
4	Old English	-ung	forming nouns from verbs, denoting verbal action...
5	Proto-Germanic	-ungō	-ing, -ion. "Forms gerund nouns from verbs."

Every word from Proto-Germanic -ungō →Every word from English -ing →Every word from Old English -ung →