challenges

Strongest matches

objection, protest, test, threat

Strong matches

claiming, confrontation, dare, defiance, demanding, demur, interrogation, provocation, remonstrance, trial, ultimatum

Weak match

summons to contest

Strongest matches

ask for, assert, call for, claim, confront, defy, demand, denounce, impose, require, test, try

Strong matches

accost, arouse, beard, brave, cross, dare, exact, impeach, impugn, inquire, investigate, provoke, query, reclaim, stimulate, summon, tax, vindicate

Weak matches

call out, face down, face off, face the music, fly in the face of, hang in, insist upon, invite competition, make a point of, make a stand, object to, search out, stand up to, stick it out, throw down the gauntlet