A recognised or important person, a celebrity.

some person.

A partially specified but unnamed person. / an important person

(transitive, idiomatic) To harp on; to remind continuously (especially of a misstep or defeat).

(idiomatic) To impress greatly; amaze; stun.

(idiomatic) To cause lasting annoyance, irritation, or hard feelings.

An uncertain or unspecified thing; one thing. / (colloquial, of someone or something) A quality to a moderate degree. / (colloquial, of a person) A talent or quality that is difficult to specify.

Having a characteristic that the speaker cannot specify.

(degree) Somewhat; to a degree. / (colloquial, especially in certain set combinations) Used to adverbialise a following adjective

Applied to an action whose name is forgotten by, unknown or unimportant to the user, e.g. from words of a song.