patto
Something happening abruptly and brightly — lights turning on, flowers blooming, or a face lighting up. Carries a sense of instantaneous, eye-catching change.
💡Describing someone's reaction — 'Her face patto brightened when she heard the news.'
彼女の顔がぱっと明るくなった。
Her face patto lit up with joy.
The fireworks ___ lit up the night sky.
花火が夜空を○○照らした。