〜だす

Pattern: 〜だす
Level: N4
Reading: 〜だす
Meaning: to suddenly start doing / to burst out doing
Attaches to: Verb (ます-stem)
Nuance & register: Emphasizes a sudden, unexpected, or uncontrollable start of an action or natural phenomenon.
Example: さっきまで晴れていたのに、突然雨が降りだした。 Even though it was sunny a moment ago, it suddenly started to rain.
Easily confused with: 〜はじめる