signal flag

The linesman raised his flag to signal that the ball was out of play.

巡边员举旗示意球已出界.

To convey ( a message or signal ) by waving an upraised arm, a flag, or a light.

打旗语发信号,用灯光发信号通过摇摆举起的手臂 、 旗子或灯来传达 ( 信息或记号 )

Then the rain came and the red flag went up to signal a halt.

然后下雨了，红旗升起示意暂停。

Its function consists of data-gathering, digital trap, data signal, flag alarm, digit communication and so on.

系统软件的主要功能有：数据采集功能、数字滤波功能、线性化处理功能、信号报警功能、数据通信功能等。

Send a signal by waving a flag or a light according to a certain code. A white flag is used as a token of surrender.

挥舞旗帜作为一种信号。白旗是用作投降的信号。

In olden days, of course, a flag-lieutenant was in charge of the Admiral's signal flags.

当然在过去，副官掌管着舰队司令的信号旗。

( military) the beating of a drum as a signal for lowering the flag at sundown.

（军事）作为日落降旗信号的鼓声。