signal(signalled, signalled; signalling, signaled, signaled; signaling)英,美

vt

1. 发信号；用信号联络

• He signalled the taxi to stop by raising his hand. 他举手示意出租车停下。

2. 用信号示意

• The bell signals that the class begins. 铃声表示上课时间到了。

3. 成为…的标志；表明

• The shortening of the daytime signals the end of summer. 白天的缩短标志着夏天的结束。

vi 发信号；打信号

• The ship signaled for help. 船发出信号求救。