signal
英 ['sɪgn(ə)l] 美 ['sɪgnl]
n. 信号；暗号；导火线
vt. 标志；用信号通知；表示
adj. 显著的；作为信号的
vi. 发信号
n. (Signal)人名；(瑞典)西格纳尔
例句：
The signal agreed on between my father and me was that if he was her heir without being her husband I was to kick him under the table and he would not propose — otherwise he would.
我与父亲约定的信号是，假如他已经是继承人，我就在桌子下踢踢父亲的腿，那么他不会求婚——否则，他就会当晚求婚。
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