close friend, bosom buddy / crony, chum

乙: the second of the ten stems (十干 (jikkan))

木下: a surname

the second of the ten Heavenly Stems

a surname / a place name

(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

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

personal, private / secret