knocking snow off (footwear, etc.)
Refers to the act of tapping or knocking snow off one's shoes, clogs, or other footwear before entering a building. Often associated with traditional Japanese clogs (下駄) in snowy weather.
I knocked the snow off my shoes at the entrance before going inside.
Compound of 雪 (yuki, 'snow') + 叩き (tataki, 'hitting' or 'knocking'). The exact historical derivation is uncertain, but the word transparently describes the action of knocking off snow.