'To protest a note' definitions:

Definition of 'To protest a note'

From: GCIDE

Protest \Pro*test"\, v. t.
1. To make a solemn declaration or affirmation of; to proclaim; to display; as, to protest one's loyalty. [1913 Webster]
I will protest your cowardice. --Shak. [1913 Webster]
2. To call as a witness in affirming or denying, or to prove an affirmation; to appeal to. [1913 Webster]
Fiercely [they] opposed My journey strange, with clamorous uproar Protesting fate supreme. --Milton. [1913 Webster]
To protest a bill or To protest a note (Law), 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 the nonacceptance or the nonpayment of the bill or note, as the case may be. This should be made by a notary public, whose seal it is the usual practice to affix. --Kent. --Story. [1913 Webster]