出典:Wiktionary

Probably from dialectal fossick (“to ferret out”),[2] fossuck (“troublesome person”), fussick (“to potter over one's work”), fussock (“to bustle about”), further origin uncertain. Compare fuss.
fossick (三人称単数 現在形 fossicks, 現在分詞 fossicking, 過去形および過去分詞形 fossicked)