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