• give reasons or cite evidence in support of an idea, action, or theory, typically with the aim of persuading others to share one's view

Synonyms: contend, assert, declare, maintain, state, proclaim, advance, insist, hold, claim, aver, avow, reason, attest, expostulate, testify, swear, certify

• exchange or express diverging or opposite views, typically in a heated or angry way

Synonyms: quarrel, disagree, row, squabble, bicker, fight, wrangle, dispute, feud, have a row, bandy words, have words, cross swords, lock horns, be at each other's throats