Countersigns

[Jessica]

to write your name on a document that already has the signature (= name written) of another person, especially in order to show that you are certain that the first person is who they say they are:

[Tanya Shivari]

to sign an important document that someone else has already signed, in order to make it able to be accepted:

[Magaret]

1 : a signature attesting the authenticity of a document already signed by another. 2 : a sign given in reply to another specifically : a military secret signal that must be given by one wishing to pass a guard. Other Words from countersign Synonyms Example Sentences Learn More About countersign.