wigwag , v :
To move gently in one direction and then another; to wig or wiggle, to wag or waggle. To oscillate between two states. (US, military, historical) To send a signal by waving a flag to and fro.
Source http://handbookblogger.blogspot.com/2017/09/wigwag-word-of-day-for-september-2-2017.html
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