Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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all of a sudden suddenly; without warning.
sudden death a type of overtime period in various sports, such as hockey and football, following a tie score at the end of the regulation playing time, in which the first team to score wins the game; sudden-death overtime.
sudden infant death syndrome the unexpected death of a seemingly healthy infant, usu. occurring within the first year of life, and usu. occurring in the infant's sleep; crib death.