A prearranged reply to a challenge, as from a guard or sentry; a password.(noun)
A rallying cry: Let our watchword be freedom. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "watchword" in a sentence
"His watchword is always duty; and he never forgets that the nation which lets its duty get on the opposite side to its interest is lost."
"I agree that we are treading on slippery ground, so my watchword is "post like a good food critic" i.e. what happened and where without getting into "terrible" and such as adjectives."
"Their watchword is "All in" -- all in with everything they have, their savings, their property, their skill, the service of their hands, if necessary the service of their lives."