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

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

Alternative spelling of 私達 (“we; us”)

to use one's head

use one thing for many purposes / work someone hard

a composite number

compound word

(furniture, laundry) a washboard for scrubbing laundry.