Used in contrast to anyone, someone or everyone: not one person; nobody.

An exclamation or expression of alarm, concern, or resentment about a problem or error.

(wrestling) Without restrictions on holds or what opponents may do.

a transuranic chemical element (symbol No) with an atomic number of 102.

A phrase used in notices indicating that the smoking of cigarettes, etc., is not permitted in the surrounding area.

(electronics, of a relay) Initialism of normally open.

(Roman Catholicism) Initialism of Novus Ordo.

(now only in slang) The head. / (cribbage) A jack of the same suit as the card turned up by the dealer. (See also nibs.)

(informal) To hit in the head

(Britain, Australia, slang) To injure or obstruct intentionally. / (Britain, slang) To gain influence by corrupt means or intimidation. / (Britain, slang) To steal.