nunc aut nunquam Posted in N Best definition nunc aut nunquam Latin phrase meaning “Now or never”. Also the slogan of the Dutch Commando Forces. Come on, man, don’t back down now. Nunc aut nunquam! How satisfied are you with the definition? Looking for nunc aut nunquam meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 8 times.