• Countersign

    Origin

    From Middle French contresigne

    Full definition of countersign

    Noun

    countersign

    (plural countersigns)
    1. a second signature added to a document to affirm the validity of the signature of the first person
    2. The response to a sign or signal.Only those who give the countersign may enter the Masonic Lodge.

    Verb

    1. (transitive) To sign on the opposite side of (an instrument or writing).
    2. (transitive, by extension) to add a second signature to a document, affirming the validity of the signature of another person
    © Wiktionary