Starting something with 〜出す
Grammar: Time and Sequence
Add 出す to a verb stem for an abrupt or spontaneous beginning. Depending on the verb, English may use “start to ~” or “burst out ~ing”.
Usage Notes
〜出
Use 〜始 Kei’ichi must enter the university system to add a record showing Belldandy is enrolled. He only has a brief window of opportunity before Professor Ozawa logs into the system and discovers she isn’t enrolled. The only thing standing in Kei’ichi’s way is the university’s enrollment records password protection. Takagi and Nishikata share an umbrella to walk home after school. Takagi says she completely forgot the term for two people sharing an umbrella. Nishika, with embarrassment, mutters that it’s あいあいがさ. When Takagi asks him to repeat it louder, he keeps quiet in his embarrassment.Related Grammar
Examples
Figuring out the password with 見つけ出す

Suddenly remembering with 思い出す
