Pacify : quell the anger, agitation, or excitement of. Quarrel : a heated argument or disagreement, typically about a trivial issue and between people who are usually on good term. Challenge : a call to someone to participate in a competitive situation or fight to decide who is superior in terms of ability or strength. Threaten : state one's intention to take hostile action against (someone) in retribution for something done or not done. Darken : make or become dark or darker.