countersign[noun]Synonyms: password, watchword, word
[TahlilGaran] English Synonym Dictionary ▲
coun‧ter‧sign /ˈkaʊntəsaɪn $ -ər-/
verb [transitive] to sign a paper that has already been signed by someone else:
The note must be countersigned by a doctor. [TahlilGaran] Dictionary of Contemporary English ▲