This shows an action starts suddenly. It happens fast and sometimes without anyone planning it.
Verb [stem] + 出すPrimary
This shows an action starts suddenly. It happens fast and sometimes without anyone planning it.
話の途中で、彼女は急に泣き出した。
In the middle of the conversation, she suddenly burst into tears.
ゴールの瞬間、スタジアム中から歓声がわき出した。
The moment the goal was scored, cheers erupted from all over the stadium.
彼はなかなか本心を語り出さないので、何を考えているか分からない。
He doesn't readily start talking about his true feelings, so I don't know what he's thinking.
さっきまで晴れていたのに、突然雨が降り出しましたね。
It was sunny until just a moment ago, but it suddenly started raining, didn't it?
走り出した子供は、あっという間に見えなくなった。
The child who started running was out of sight in an instant.
This grammar shows something starting very suddenly. It's like a burst of action, quick and often a surprise. Think of a light switch flipping on.
This is different from "~hajimeru". "~hajimeru" means to start something on purpose. You can plan to do it. "~dasu" is for things that start suddenly. It is not for planned actions. "~kakeru" means an action has started but is not finished.
Don't use this when something starts slowly. For example, you wouldn't say "建て出す" for building a house. This is because building a house takes a long time. You use it for things that start fast. These can be things like moving, making sounds, or showing feelings. It is for things that begin all at once.
Often confused with(1)
Less formal alternatives(1)
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