n. 25B6; verb
nobody dared to say a word : BE BRAVE ENOUGH, have the courage; venture, have the nerve, have the temerity, be so bold as, have the audacity; risk, hazard, take the liberty of; N. Amer. take a flyer; informal stick one's neck out, go out on a limb.
she dared him to go : CHALLENGE, defy, invite, bid, provoke, goad; throw down the gauntlet.
25B6; noun she accepted the dare : CHALLENGE, provocation, goad; gauntlet, invitation.