Person or entity whose name one does not want to mention but which is known to the person to whom one is speaking.

(idiomatic) A phrase used at parting, and not necessarily implying that the person being addressed will be seen later by the speaker.

really?; no kidding!; is that so? (sometimes used sarcastically in response to the obvious)

(economics) A financial policy by which capital projects are financed from current revenue in the operating budget rather than through borrowing.

Alternative spelling of you-know-who

(rhetorical question, sarcastic) Used in response to someone’s threat suggesting that the person in question cannot do what she or he says alone.

(informal) Expresses dismay or annoyance, especially at misfortune.

Asks the age of the interlocutor. / (impolite) Used to question the mental age (maturity) of the interlocutor.

(idiomatic) Used to express gratitude at unnecessary generosity, especially when receiving a gift.

A polite formula used when being introduced to somebody.