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〜出す

suddenly start doing, burst into

Verb ます-stem + 出す

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Add 出す to the ます-stem and the action bursts out, suddenly and often without warning: 急に雨が降り出した, "it suddenly started pouring". Compare 降り始めた, which just says it started.

It's common with things that happen to people, or with the weather, rather than planned actions: 泣き出す, "burst into tears"; 笑い出す, "burst out laughing"; 走り出す, "break into a run".

Because it suggests something unplanned, it's odd with deliberate starts. For "I started studying Japanese last year", use 始める, not 出す.

It conjugates like 出す itself, a godan verb: 出した, 出して, 出しそう.

Examples

  • 急きゅうに雨あめが降ふり出だした。

    It suddenly started raining.

  • 赤あかちゃんが急きゅうに泣なき出だしました。

    The baby suddenly burst into tears.

  • みんなが一斉いっせいに笑わらい出だした。

    Everyone burst out laughing at once.

  • 信号しんごうが青あおになると、車くるまが走はしり出だしました。

    When the light turned green, the cars pulled away.

  • その話はなしを聞きいて、彼かれは急きゅうに怒おこり出だした。

    When he heard that, he suddenly got angry.

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