countersun ( synonym found)
Definition of countersun:

°a second signature added to a document to affirm the validity of the signature of the first person.
°to add a second signature to a document, affirming the validity of the signature of another person.
Definition of countersun:

°a second signature added to a document to affirm the validity of the signature of the first person.
°to add a second signature to a document, affirming the validity of the signature of another person.
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