Meaning of SEMAPHORE in English
1》 a system of sending messages by holding the arms or two flags or poles in certain positions according to an alphabetic code.
2》 an apparatus for signalling in this way, consisting of an upright with movable parts.
■ verb send by ~ or by signals resembling ~.
C19: from Fr. sémaphore , formed irregularly from Gk sēma 'sign' + -phoros .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004