Antonyms for counter-sign

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR COUNTER-SIGN

The captain of the head-barricade in the Corso demurred, requiring a counter-sign.

Youve been away so long that you must have forgotten the counter-sign.

In the second fable the fox leaves her little ones at home, bidding them admit no one without a counter-sign.

The sentinel on duty stopped him, as of course, but he was in possession of the counter-sign, and entered without opposition.

Short as was the distance, they were challenged twice, and the sign and counter-sign had to be exchanged.