One of the mysteries of the English language finally explained.
1‘reports of the massacre could not be verified’
substantiate, confirm, prove, show to be true, corroborate, back up, support, uphold, evidence, establish, demonstrate, demonstrate the truth of, show, show beyond doubt, attest to, testify to, validate, authenticate, endorse, certify, accredit, ratify, warrant, vouch for, bear out, bear witness to, give credence to, give force to, give weight to, lend weight to, justify, vindicate
make sure, make certain, check
informal pin down
British informal suss out
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