godan verb (-su)
knock down; knock off; swat down
To strike something and cause it to fall or be dislodged, often with a sweeping or batting motion. Used for physical objects like insects, hats, or items from a surface.
彼はハエを叩き落とした。
He swatted the fly down.
風で帽子が飛ばされ
The wind almost blew my hat away, but I knocked it down with my hand and caught it.