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Mayday

noun
🔊/ˈmeɪdeɪ/
🔊/ˈmeɪdeɪ/
 [uncountable]
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  1. an international radio signal used by ships and aircraft needing help when they are in danger（船只或航空器遇险时用的国际无线电求救信号）Topics Transport by waterc2, Transport by airc2
    Word OriginFrom the French venez m’aider ‘come and help me’.