To blow off or blow away (dust, leaves, etc.) with breath or wind. Also used figuratively to dispel concerns, doubts, or gloom.
ベランダの落ち葉をほうきで掃いてから、最後に息で軽く吹き払った。
After sweeping the balcony leaves with a broom, I finally blew them away lightly.
彼女の明るい冗談が部屋の重い雰囲気を吹き払った。
Her cheerful joke cleared the heavy atmosphere in the room.
テーブルのパンくずを指で集めて吹き払った。
I gathered the bread crumbs on the table with my finger and blew them away.