(idiomatic) The boss, the leader. / (idiomatic, dated) The principal comedian in a vaudeville or burlesque show.

(idiomatic) The boss, the leader (of the pack). / (idiomatic) In a competition, the one expected to win.

(US, idiomatic) To outdo oneself or do more than one's previous best.

(Britain, slang) To commit suicide.

(informal, derogatory) A person with red hair; a redhead.

(colloquial) A tabloid newspaper in the United Kingdom.

(physics) A quark having a fractional electric charge of +2/3 and a mass of about 178,000 MeV. / Symbol: t

Alternative form of top-priority

(uncountable) Relatively highest importance. / (countable) Item of highest importance.

Of or relating to a hierarchical system that progresses from a single, large basic unit to multiple, smaller subunits. / Produced, controlled, or directed by those at the top of the hierarchy.