close friend, bosom buddy / crony, chum

a duck / (slang) (from the way ducks return to the same place and are thus easy to hunt) a mark or easy target for a swindle, someone who is likely to lose at gambling or other competition

a surname / any of various places, particularly in Kyoto

(rare) alternative spelling of 家鴨: a domestic duck, Anas platyrhynchos var. domesticus, descended from the mallard

“to make a duck of someone”: to skillfully or cunningly beat out an opponent, such as in gambling or a swindle; compare English to make a monkey out of, to shark someone

wild duck / mallard

(chiefly women's speech) first person singular pronoun: I, me

(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness

(formal) first-person singular pronoun: I, me