wigwag

动词 wigwag:

1. send a signal by waving a flag or a light according to a certain code
2. signal by or as if by a flag or light waved according to a code

wig.wag

v.（动词）
wig.wagged,wig.wag.ging,wig.wags
v.intr.（不及物动词）
To move back and forth; wag steadily or rhythmically:
摇动，摇摆：前后移动；稳定而有节奏地摇摆：
例句：
watched the pendulum wigwag.
观察钟摆的摆动

To signal by waving an upraised arm, a flag, or a light, especially in accordance with a code.
打旗语，用灯光发信号：通过摇动举起的手臂、旗子或灯来示意，尤指按符号示意
v.tr.（及物动词）
To move (something) back and forth steadily or rhythmically.
摇动：前后稳定而有节奏地移动（某物）
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）
n.（名词）
The act or practice of wigwagging.
摇动，摇摆：摇摆的动作或作法
A message sent by this method.
旗语信号，灯光信号：通过旗语、灯语或手势传达的消息

来源：
Dialectal wig [to move]
方言 wig [移动]
wag
wag

【引伸】
wig.wag.ger
n.（名词）