noun
a device for signaling by means of two flags or lights waved according to a code
verb
to signal with a wigwag
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The engineer installed a wigwag signaling device at the railroad crossing.
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I saw the conductor waving the wigwag to alert the cars.
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I love how the wigwag lights up when the train is coming!
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Her emotions were like a wigwag, constantly changing and unpredictable.