The flashcard defines 'semaphore' as a noun meaning 'a system of visual signals' or 'flag signals', and as a verb meaning 'to signal'.
semaphore 是一个名词，意思是“信号”或“旗语”；也是一个动词，意思是“打信号”或“打旗语”。
| Front | semaphore [sema-;phor;-e] |
|---|---|
| Back | n.信号； 旗语v.打信号； 打旗语 |
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