be a witness

announce indicate

affirm argue attest bespeak betoken certify confirm corroborate countersign depone depose endorse sign subscribe

bear out bear witness give evidence give testimony say under oath stand for vouch for

conceal hide

contradict deny invalidate oppose reject repudiate veto

participate refute

attend mark note notice see watch

behold eyeball perceive pipe read sight spot spy view

be on hand be on the scene be present flash on get a load of look on pick up on take in

ignore neglect overlook

deny participate refute