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English definition of “sudden”

sudden

adjective     /ˈsʌdən/
B2 done or happening quickly and unexpectedly: a sudden change/increase His sudden death was a great shock to us all.Not expected or planned
all of a sudden B2 unexpectedly: All of a sudden she got up and walked out.Not expected or planned
suddenness noun [U]
(Definition of sudden adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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