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From Longman Dictionary of Contemporary English
Related topics: Telephone, telegraph
maydaymay‧day /ˈmeɪdeɪ/ noun [singular]  TCTa radio signal used to ask for help when a ship or plane is in serious dangerSOS
Examples from the Corpus
maydaySend out a mayday, jump in and wait.The pilot sent out a mayday.We sent out a mayday, but your guess is as good as mine if anyone heard it.
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