Incorrect spelling, explanation: this is a mistaken form, because the only case we double the last consonant in this word is when adding some suffixes (for example occurring). The base form, however, remains with one r – occur. Therefore occur is correct, while
occurr is a misspelling.
Correct spelling, explanation: there is no need to double the last r in occur in its general form – lexical nor pronunciation-connected. Of course, according to the rule of doubling the last consonant in case of consonant-vowel-consonant ending combination, this last r will double when we add any suffix to it (for example occurred). However in base form it remains with one r. Therefore occur is correct and
Definition of occur:
verb, to appear, to take place
If clouds occur in the sky, it will probably rain soon.
Behaviour like this shouldn’t occur in the classroom.
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