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semaphore

American  
[sem-uh-fawr, -fohr] / ˈsɛm əˌfɔr, -ˌfoʊr /

noun

  1. an apparatus for conveying information by means of visual signals, as a light whose position may be changed.

  2. any of various devices for signaling by changing the position of a light, flag, etc.

  3. a system of signaling, especially a system by which a special flag is held in each hand and various positions of the arms indicate specific letters, numbers, etc.


verb (used with or without object)

  • semaphores,
    present (3rd person singular)
  • semaphored,
    past participle,  past
  • semaphoring
    present participle
  1. to signal by semaphore or by some system of flags.

semaphore British  
/ ˌsɛməˈfɒrɪk, ˈsɛməˌfɔː /

noun

  1. an apparatus for conveying information by means of visual signals, as with movable arms or railway signals, flags, etc

  2. a system of signalling by holding a flag in each hand and moving the arms to designated positions to denote each letter of the alphabet

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

  1. to signal (information) by means of semaphore

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Conjugated Forms

Present

Past

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Etymology

Origin of semaphore

First recorded in 1810–20; from French sémaphore, from Greek sêma “sign”; see -phore

Explanation

A semaphore is a gadget used for conveying signals. Semaphores have either lights or mechanical arms that move. The word semaphore is related to a Greek word meaning "signal," and that's exactly the purpose of semaphores: they give signals. The place you're most likely to have seen a semaphore is a railroad crossing: the gadget with moving arms is a semaphore. Some semaphores have mechanical arms, while others just use lights to communicate. A semaphore system can also use flags. In all cases, semaphores give visual signals that communicate something important, especially to people traveling.

Keep Reading on Vocabulary.com

Vocabulary lists containing semaphore

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Whenever someone got into trouble, Barron would unfurl her semaphore flags and signal for help.

From Seattle Times May 30, 2024

On the left shoulder, front, a cluster of schematic semaphore signals evokes his years in the Marines.

From New York Times May 5, 2023

We also found semaphore flags, a vastly outdated way to communicate between units.

From BBC Feb. 22, 2023

As Meher Mirza wrote for Saveur, "the word 'curry' is sometimes used in the West as a familiar semaphore, but the term ossifies the immense sophistication and complexity of Indian food."

From Salon Sep. 12, 2021

He’s doing pretend semaphore, waving his arms in ornate patterns as if I’m supposed to understand some kind of secret code.

From "We Were Liars" by E. Lockhart

Today, to help relative newcomers navigate potential April Fool’s foibles, our crack “Now & Then” team shares some quirky codes and stubborn semaphores from “Then” days that persist in the “Now.”

From Seattle Times Mar. 30, 2023

And they’re off: Back from his spell in self-isolation and having passed all his Covid-19 tests, Christian Prudhomme emerges from his Skoda’s sun-roof and semaphores the signal to start to racing.

From The Guardian Sep. 15, 2020

It undermines the piety and ethical lapses in nonfiction mystery shows, while sharing with “Three Billboards” a belief in semaphores and that people aren’t any one thing.

From New York Times Jan. 18, 2018

But he can slay without words: His eyebrows are semaphores, his left hand a weapon that can dismiss a subject with a quiver.

From Washington Post May 24, 2016

Enrique's Journey Then he sees switches and semaphores.

From "Enrique's Journey" by Sonia Nazario

The start of today’s race has been semaphored and a group of six riders have attacked off the front of the bunch.

From The Guardian Jul. 11, 2019

With these ones ripped up and destroyed, and made into something else entirely, they perhaps semaphored a new era.

From The Guardian Sep. 9, 2014

Elsewhere in the opening episode nothing happened that wasn't first semaphored in the previous scene.

From The Guardian Feb. 27, 2011

As her advisers and courtiers semaphored behind her to wave off the truth, antiroyalist Hytner smiled sweetly and said, "It's hereditary."

From Time Magazine Archive

Then he semaphored directions to Pennell, and on the following morning the ship worked her way along the ice-edge to the spot that had been chosen.

From The Voyages of Captain Scott : Retold from the Voyage of the Discovery and Scott's Last Expedition by Charles Turley

Though we’re trying to connect, it feels like I’m standing on one side of a rushing river and she’s on the other, semaphoring her thoughts across at me.

From The Guardian Nov. 12, 2017

Even taskmaster Guardiola was spied clapping on the touchline at one point instead of being his usual manic semaphoring self.

From The Guardian Nov. 5, 2016

Apple employees may not talk much, but they’ve been semaphoring pretty furiously lately.

From Forbes Jul. 8, 2011

Seoul's black-marketeers went imperturbably about their chores, blowing their whistles and semaphoring energetically with their hands whenever a jeep or oxcart hove into sight.

From Time Magazine Archive

I half expected to see the few remaining insects circling him and semaphoring their romantic intentions.

From "The Evolution of Calpurnia Tate" by Jacqueline Kelly

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