Meaning

verb establish or strengthen as with new evidence or facts

verb give evidence for

verb support with evidence or authority or make more certain or confirm

originFirst attested in the 1530s; borrowed from Latin corrōborātus (“strengthened”), perfect passive participle of corrōborō (“to support, corroborate”) (see -ate (verb-forming suffix) and -ate (adjective-forming suffix)), from con- (“together”) + rōborō (“to strengthen”), from rōbur, rōboris (“strength”). Regular participial usage of the adjective up until Early Modern English, otherwise archaic.

Etymology from Wiktionary, CC BY-SA 3.0