a secret word or phrase known only to a restricted group;
"he forgot the password"
a second confirming signature endorsing a document already signedVerb
add one's signature to after another's to attest authenticity;
"You must countersign on this line of the contract"
The back shows petroleum prospecting and the countersign is the same as the 5 yuan.
Traveller's check need countersign.
countersigns近义词password watchword signal witness endorse sign attest authenticate corroborate certify notarize secret parole countersignature word