paatto
A burst of bright light that spreads outward instantly, like curtains thrown open to sunlight, a room lit up by a switch, or a face that lights up with joy. Conveys a cheerful, dramatic brightening.
💡Opening blackout curtains in the morning — 'Sunlight flooded in paatto and the whole room turned bright.'
カーテンを開けたら部屋がぱあっと明るくなった。
When I opened the curtains, the room became bright paatto.
She opened the curtains and sunlight came in ___, filling the room.
カーテンを開けると、日差しが○○差し込んで部屋中が明るくなった。