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English definition of “occur”

occur

verb uk   /əˈkɜːr/ us    /-ˈkɝː/ (-rr-)

occur verb (HAPPEN)

B2 [I] (especially of accidents and other unexpected events) to happen: An accident involving over ten vehicles has occurred in the east-bound lane. If any of these symptoms occur while you are taking the medicine, consult your doctor immediately.

occur verb (EXIST)

[I + adv/prep] to exist or be present in, among, etc.: Violence of some sort seems to occur in every society. Minerals occur naturally in the Earth's crust.
Phrasal verbs
(Definition of occur from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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