verb
BAD : In the first class after lunch we usually argue.
GOOD : In the first class after lunch we usually have a discussion.
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When people argue (or quarrel ), they disagree strongly about something and are often angry or upset: 'Parents should try not to argue in front of their children.' 'We were always arguing about silly things, like whose turn it was to do the shopping.'
When people consider a subject from several points of view, they have a discussion or have a debate (= a formal discussion in which two or more groups take it in turns to present their opinions) .