What is the meaning of 家鴨?

domestic duck (the domesticated variety of mallard)

a domestic duck (a domesticated variety of mallard)

a woman who is short and has a large butt

an academic grade of “B(from the way the (otsu) character, used to indicate this grade, looks vaguely like a duck)

an amphibious truck (from the English duck)

a domestic duck

Source: wiktionary.org