countersign
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coun·ter·sign

noun \-ˌsīn\

Definition of COUNTERSIGN

1
: a signature attesting the authenticity of a document already signed by another
2
: a sign given in reply to another; specifically : a military secret signal that must be given by one wishing to pass a guard
countersign transitive verb
coun·ter·sig·na·ture \ˌkan-tər-ˈsig-nə-ˌchr, -chər, -ˌtyr, -ˌtr\ noun

Examples of COUNTERSIGN

  1. <the guard demanded the countersign>

First Known Use of COUNTERSIGN

1591

Related to COUNTERSIGN

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