close friend, bosom buddy / crony, chum

“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

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

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

wild duck / mallard

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

a personal or private matter / selfishness / privacy, secrecy / (women's speech, obsolete) a brother-in-law

personal, private / secret

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