To call as a witness in affirming or denying, or to prove an affirmation; to appeal to.
to make a solemn written declaration, in due form, on behalf of the holder, against all parties liable for any loss or damage to be sustained by non-acceptance or non-payment of (a bill or note). This should be made by a notary public, whose seal it is the usual practice to affix.
From the Middle English verb protesten, from Old French protester, from Latin prōtestārī, present active infinitive of prōtestor, from prō + testor, from testis.
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