かじかむ

godan verb (-mu), intransitive verb

grow numb with cold; become stiff from cold

Describes fingers, hands, or other body parts losing sensation and becoming difficult to move due to cold. Often used in winter contexts.

• 寒さむさで指ゆびがかじかんで、うまく字じが書かけない。

  My fingers are numb from the cold and I can't write properly.

• 手てがかじかんで、鍵かぎがうまく回まわせなかった。

  My hands were so stiff from the cold that I couldn't turn the key well.