To be spoiled; to have an easy life without appreciating it.

(idiomatic, vulgar) To be well-informed concerning a particular subject; to have a capable command of a particular area of expertise.

It is necessary to be informed in order to do the right thing in a given situation.

The name of something the speaker does not want to mention, but which is known, or very likely to be known, to the listener. It can be plural (as in "... the you-know-whats").

(idiomatic) A phrase used to get someone's attention before announcing something.

(of the giving of information) remaining secret or hidden until it is needed to be known (by a particular party).

(usually in the past tense) To have known a famous person before he or she was famous.

(chiefly US, in negative constructions) To know something, even if only a little, about. / (chiefly US, idiomatic) To know nothing, or almost nothing, about.

Used to speculate about a slight possibility.

(idiomatic) Alternative form of wouldn't you know it