Use the verb occur when an event or a thought happens, like when it occurs to you that you've left home without your umbrella. Maybe you didn't hear the forecast that showers would occur this afternoon.

The verb occur comes from the Latin, occurrere, “to meet” or “to present itself.” When something occurs, it comes into being, like a thought that seems to present itself from out of the blue, like when it suddenly occurs to you that you forgot to ask your guests if they'd like a cup of tea, or that it would never occur to your Mother that some people spend a small fortune on handbags. Events can also occur, meaning "take place," like a meeting that will occur tomorrow.

Definitions of occur
  1. verb
    come to pass
    “Nothing occurred that seemed important”
    synonyms: come about, fall out, go on, hap, happen, pass, pass off, take place
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    break, develop, recrudesce
    arise, come up
    result or issue
    come about or follow as a consequence
    occur between other events or between certain points of time
    come about, happen, or occur
    take place as an additional or unexpected development
    go, proceed
    follow a certain course
    come to pass; arrive, as in due course
    occur at a specified time or place
    be a forerunner of or occur earlier than
    be gradually disclosed or unfolded; become manifest
    recur, repeat
    happen or occur again
    come off, go off, go over
    happen in a particular manner
    come around, roll around
    happen regularly
    happen, materialise, materialize
    come into being; become reality
    bechance, befall, happen
    happen, occur, or be the case in the course of events or by chance
    bechance, befall, betide
    become of; happen to
    coincide, concur
    happen simultaneously
    backfire, backlash, recoil
    come back to the originator of an action with an undesired effect
    be the case by chance
    happen or take place
    fall, shine, strike
    touch or seem as if touching visually or audibly
    turn out
    prove to be in the result or end
    contemporise, contemporize, synchronise, synchronize
    happen at the same time
    drag, drag on, drag out
    proceed for an extended period of time
    descend, fall, settle
    come as if by falling
    run or be performed again
    recur in repeating sequences
    develop due to condensation
    appear, come out
    be issued or published
    open, open up
    become available
    chance to be or do something, without intention or causation
    come, do, fare, get along, make out
    proceed or get along
    come up
    be mentioned
  2. verb
    come to one's mind; suggest itself
    “It occurred to me that we should hire another secretary”
    synonyms: come
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    type of:
    come into existence
  3. verb
    be found to exist
    “precious stones occur in a large area in Brazil”
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    geminate, pair
    occur in pairs
    occur persistently
    have a strong tendency to occur side by side
    abound in, pullulate with, teem in
    exist in large quantity
    type of:
    appear, come along
    come into being or existence, or appear on the scene
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