one day; (on) a certain day
on one occasion; once; at one point; at one time
someone (unspecified, but someone in particular); a certain person
certain; some kind of; some sort of; of sorts
to some extent; to a certain extent
① もしかすると。ひょっとしたら。② 同類の事柄を列挙してそれらすべてを含むことを指す。一方では。