At this moment; right now. / (dated) At that time; then.

(idiomatic) To fail in one's responsibilities or duties, or to make a mistake, especially at a critical point or when the result is very negative.

A letter written to a newspaper, magazine or other periodical, usually intended for publication, about issues of concern to readers.

(idiomatic, singular only) An obscene gesture, typically consisting of extending the middle finger at somebody.

A room in a hospital used for performing surgery (originally designed for operations in front of observers).

(idiomatic) Phrase used to indicate that if a specified activity is not continued or carried out, those who seek to disrupt normal activities through terror will have succeeded, which is an unacceptable result.

Important, indispensable, crucial.

(set phrase) Time is an essential consideration (in regard to an action or response); haste is necessary.

(chiefly US) To make the decisions; to be in charge; to give orders.

(idiomatic) Crazy, mad or insane. / (idiomatic) Close to or in close proximity to another location.