defend
verb
1 a tower built to defend Ireland from Napoleon's threatened invasion | we will defend freedom of speech:
protect, guard, safeguard, keep from harm, preserve, secure, shield, shelter, screen;
fortify, garrison, barricade;
fight for, uphold, support, be on the side of, take up cudgels for;
watch over, be the defender of.
▷antonyms attack.
2 he defended his policy of charging high interest rates:
justify, vindicate, argue/speak for, speak on behalf of, support, speak in support of, give an apologia for, make a case for, plead for, make excuses for, excuse, exonerate, palliate;
explain, give reasons for, give the rationale behind.
▷antonyms attack, criticize.
defend Oxford Dictionary of English