Meaning of “occur” in the English Dictionary

"occur" in British English

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occurverb

uk /əˈkɜːr/ us /əˈkɝː/ -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 medication, consult your doctor immediately.

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Phrasal verb(s)

(Definition of “occur” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"occur" in American English

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occurverb [ I ]

us /əˈkɜr/ -rr-

occur verb [ I ] (HAPPEN)

(esp. of unexpected events) to happen:

The incident occurred shortly after the plane took off.

occur verb [ I ] (EXIST)

to exist or be present:

The condition occurs primarily in older adults.
Helium occurs as a byproduct of natural gas.

Phrasal verb(s)

(Definition of “occur” from the Cambridge Academic Content Dictionary © Cambridge University Press)