Correct spelling, explanation: the origin of the English verb occur is a Latin word occurrere, which had a slightly different meaning to the one we know today. In the present form, the word came into English in the 15th century and is commonly used in both spoken and written language. Occur is a regular verb, which causes some spelling trouble so make sure you write it correctly.

Definition of occur
1. verb – to be, happen, or exist,
The incidents used to occur quite often before we updated the system.

Expressions with occur
The verb occur usually goes together with the preposition to. The noun form is occurrence.
The fault seems to occur in the system every time I reset it.
The occurrence of the disease in this region surprised the scientists.

Incorrect spelling, explanation: quite a common mistake is to end the word occur with an ending our instead of ur. The former ending probably looks more English-like as there is an English word our. Nevertheless, the form occour is wrong while occur is correct so pay attention not to repeat this popular mistake.

Incorrect spelling

Incorrect spelling

Incorrect spelling