開あけ放はなす

godan verb (-su), transitive verb

open wide; throw open; leave open

Used for doors, windows, or similar openings; implies opening fully and often leaving them open. The 'leave open' nuance comes from context, not a separate meaning.

• 窓まどを開あけ放はなして、新しん鮮せんな空くう気きを入いれた。

  I threw open the window and let in fresh air.