noun
A confrontation; a dare.
A difficult task, especially one that the person making the attempt finds more enjoyable because of that difficulty.
(law) A procedure or action.
(hunting) The opening and crying of hounds upon first finding the scent of their game.
verb
(transitive) To invite (someone) to take part in a competition.
(transitive) To dare (someone).
(transitive) To dispute (something); to contest.
To call something into question or dispute.
(law, transitive) To make a formal objection to a juror.
(transitive) To be difficult or challenging for.
(obsolete, transitive) To claim as due; to demand as a right.
(obsolete, transitive) To censure; to blame.
(military, transitive) To question or demand the countersign from (one who attempts to pass the lines).
(US, transitive) To object to the reception of the vote of, e.g. on the ground that the person is not qualified as a voter.
(Canada, US, transitive) To take (a final exam) in order to get credit for a course without taking it.