/ kəˈrɒbəreɪt; NAmE -ˈrɑːb-/ verb
[ vn ] [ often passive ] ( formal ) to provide evidence or information that supports a statement, theory, etc.
SYN confirm :
The evidence was corroborated by two independent witnesses.
corroborating evidence
► cor·rob·or·ation / kəˌrɒbəˈreɪʃn; NAmE -ˌrɑːbə-/ noun [ U ]
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WORD ORIGIN
mid 16th cent. (in the sense make physically stronger ): from Latin corroborat- strengthened, from the verb corroborare , from cor- together + roborare , from robur strength.