Antonyms for over throw

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR OVER THROW

What to Falkland were resolutions which a word, a glance, could over throw?

The latter was never sufficiently strong to over throw and extirpate idolatry in the Roman Empire.

And who knows but that a third, a thousand years hence, may over throw the two former.