This is the 3587th most frequent Japanese word.
起こっ
The term "起こっ" is a conjugated form of the verb "起こる" meaning "to occur" or "to happen."
Here, '起こっ' is part of the verb '起こる', meaning 'to occur' or 'to happen'. It is used in past tense to describe an event that occurred.
地震が起こった。
An earthquake occurred.
In this sentence, '起こっ' is part of the verb '起こす', which means 'to evoke' or 'to bring about'. It is used to describe causing something to manifest in one's thoughts.
彼はその出来事を心に起こした。
He brought that memory into his mind.
Here, '起こっ' is again part of '起こる', used in the context of a hypothetical or future event, to indicate the occurrence of an event.