To dream of using a knocker, foretells you will be forced to ask aid and counsel of others. Other Explanations for KnockerContinue ExploringKnocker A door knocker in a dream represents the door attendant, the announcer, a messenger, a warning guard, a security system…Knocker (Door) 1. Asserting ideas or desires. 2. Reaching for help from someone behind the door. 3. Female sexual symbol.