countersign - definition and synonyms

verb [transitive] 

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/ˈkaʊntə(r)ˌsaɪn/
present tense
I/you/we/theycountersign
he/she/itcountersigns
present participlecountersigning
past tensecountersigned
past participlecountersigned
  1. to sign a document that someone else has already signed