"countersign" in the noun sense
1. password, watchword, word, parole, countersign
a secret word or phrase known only to a restricted group
"he forgot the password"
2. countersignature, countersign
a second confirming signature endorsing a document already signed
"countersign" in the verb sense
1. countersign
add one's signature to after another's to attest authenticity
"You must countersign on this line of the contract"
Source: WordNet® (An amazing lexical database of English)
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