Railway Signaling Terminology

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

• The driver came to a stop at the red light.
• I hate getting caught at a red light when I'm running late.
• I always try to beat the red light, but it's not worth the risk.
• Seeing her face turn red light up my day.

noun a system of sending messages by holding the arms or two flags or poles in certain positions according to an alphabetic code

verb to send a message using a semaphore system

• The naval officer used semaphore flags to communicate with the nearby ship.
• We can use semaphore signals to coordinate our movements during the hike.
• Let's semaphore each other when we're ready to leave the party.
• Her raised eyebrows were a semaphore of her disapproval.