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mayday ['meɪdeɪ] adj.
tech. señal internacional de socorro por radiotelefonía; SOS (llamada de socorro)
 English thesaurus
MAYDAY ['meɪdeɪ] abbr.
abbr., mil., avia. distress call
"Mayday" adj.
avia., amer. An expression meaning "I am in distress." It is the international radiotelephony distress signal. Preferably spoken three times, it indicates imminent and grave danger and means that immediate assistance is requested.