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
Examples of countersign in a Sentence
the guard demanded the countersign
Recent Examples on the Web
Blue dot signs have inspired Republican countersigns.
—
Christina Elizabeth Dando, The Conversation, 22 Oct. 2024
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Christina Elizabeth Dando, The Conversation, 22 Oct. 2024
Cite this Entry
“Countersign.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/countersign. Accessed 29 Oct. 2025.
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countersign
noun
coun·ter·sign
ˈkau̇n-tər-ˌsīn
: a signature attesting the authenticity of a document already signed by another
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