countersign
noun
coun·ter·sign
ˈkau̇n-tər-ˌsīn
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
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Merriam-Webster unabridged
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