noun a color that is the primary color at one extreme end of the visible spectrum, an object, or a light that is red in color
noun a barrier or obstacle set up to block or obstruct a road or passage
noun an object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else
verb to write one's name on (a letter, card, or similar item) to identify oneself as the writer or sender
verb to make a signal or give a signal; to mark or celebrate with a signal