onderbouwen (ww):
corroborare(en) To confirm or support with additional evidence.
(en) support something or someone by supplying evidence., appoggiare(en) support something or someone by supplying evidence., dimostrare(en) to authenticate or corroborate., documentare(en) to authenticate or corroborate., rafforzare(en) support something or someone by supplying evidence., sostenere(en) support something or someone by supplying evidence.
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Via: Memodata.com