countersign
noun
- 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
To sign on the opposite side of (a document).
- 2
(by extension) To add a second signature to a document, affirming the validity of the signature of another person.
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