disagreement - the speech act of disagreeing or arguing or disputing

collision - a conflict of opposed ideas or attitudes or goals; "a collision of interests"

contestation, controversy, disceptation, arguing, argument, contention, disputation, tilt - a contentious speech act; a dispute where there is strong disagreement; "they were involved in a violent argument"

dustup, quarrel, run-in, wrangle, row, words - an angry dispute; "they had a quarrel"; "they had words"

resistance - group action in opposition to those in power

call - challenge the sincerity or truthfulness of; "call the speaker on a question of fact"

call - challenge (somebody) to make good on a statement; charge with or censure for an offense; "He deserves to be called on that"

contest, repugn, contend - to make the subject of dispute, contention, or litigation; "They contested the outcome of the race"

argue, contend, debate, fence - have an argument about something

brawl, wrangle - to quarrel noisily, angrily or disruptively; "The bar keeper threw them out, but they continued to wrangle on down the street"

spat - engage in a brief and petty quarrel

polemicise, polemicize, polemise, polemize - engage in a controversy; "The two historians polemicized for years"

fall out - have a breach in relations; "We fell out over a trivial question"