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English definition of “aftershock”

aftershock

noun [C] uk   /ˈɑːf.tə.ʃɒk/ us    /ˈæf.tɚ.ʃɑːk/
a sudden movement of the earth's surface that often follows an earthquake and is less violent than the first main movement: The initial earthquake was followed by a series of aftershocks.Earthquakes and volcanic eruptions
(Definition of aftershock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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