noun
a distress signal used by ships and aircraft
interjection
a word used to signal distress or an emergency
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The pilot issued a mayday signal when the engine failed mid-flight.
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When the boat started taking on water, we had to call a mayday for help.
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I heard that party was a total mayday - a disaster from start to finish.
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In the midst of chaos, she felt like she was sending out a mayday signal for help.