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to wigwag
01
发信号, 挥动
signal by or as if by a flag or light waved according to a code
02
用摆动的方式发信号, 挥动（手臂）
to signal with a swinging motion, resembling the motion of a flag
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例子
The ship's signalman wigwagged flags to communicate with nearby vessels.
The aircraft marshaller wigwagged the wands to guide the plane to its parking spot.
During the parade, the drum major wigwagged the baton in time with the music.
She wigwagged her handkerchief from the train window to say goodbye.
The crossing guard wigwagged his arms to signal drivers to stop.
