(transitive) To confirm or support something with additional evidence; to attest or vouch for. / (transitive) To make strong; to strengthen.

Third-person singular simple present indicative form of corroborate

Strengthened; confirmed; rendered more certain.

simple past tense and past participle of corroborate

The act of corroborating, strengthening, or confirming; addition of strength; confirmation / That which corroborates.

One who corroborates, or verifies something; one who lends credence by upholding another's story.

present participle of corroborate

supporting

Serving to corroborate

(dated) a medical tonic; a corroborant