Countersign (legal)
WordNet

noun


(1)   A second confirming signature endorsing a document already signed
(2)   A secret word or phrase known only to a restricted group
"He forgot the password"

verb


(3)   Add one's signature to after another's to attest authenticity
"You must countersign on this line of the contract"
WiktionaryText

Noun



  1. a second signature added to a document to affirm the validity of the signature of the first person

Verb



  1. to add a second signature to a document, affirming the validity of the signature of another person
 
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