英和和英

an occurrence of something

occur

happen

Cholera has broken out.

Cholera breaks out.

having a rapid onset

to occur by chance

occur persistently

for a thing to occur

the occurrence of breaking

of a thing, to come into existence

It's becoming apparent.

Abnormalities occur

Troubles arise.

the state of projecting outward

A riot breaks out.

A reaction sets in.

Troubles arise.

when a system trouble occurs

Troubles arise.

A civil war breaks out.

Fissures occur

to produce or throw up froth

Troubles arise.

An accident happens

happen, occur, take place

spring suddenly

come into fashion

Troubles are brewing.

A rebellion has broken out.