wig-wag
n.— «They said the car…was northbound on Bathurst Street on Sunday night when the driver lost control. She was making a right turn and struck a CN wig-wag signal on the main north-south line.» —“Train gives youth rude awakening” Globe and Mail (Toronto, Canada) Apr. 22, 1986. (source: Double-Tongued Dictionary)
Further reading
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