To confirm or support with additional evidence; to strengthen or make more certain by providing proof from another source.
From Latin 'corroborare' meaning 'to strengthen,' from 'cor-' (intensive) and 'roborare' (to strengthen), from 'robur' (strength, oak tree). Oak trees symbolized strength in Roman culture.
Think 'cor-ROB-orate' like 'core-ROBUST-orate' - you're making the core argument robust by adding more evidence! Or imagine oak trees (robur) supporting each other - corroboration is evidence supporting evidence.
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