Synonyms For "Overturn" :

1 syllable:

2 syllables:

annul, bring down, repeal, rescind, reverse, revoke, subvert, upset, vacate

3 syllables:

bowl over, countermand, knock over, override, overrule, overthrow, tip over, tump over, turn over, turnover

5 syllables:

revolutionise, revolutionize