This is the 7543rd most frequent Japanese word.
冬将軍
"Winter General"; a personification of harsh winter weather.
In this sentence, '冬将軍' is used metaphorically to represent the strong cold and freezing weather typical of winter.
冬将軍がついにやって来た。
General Winter has finally arrived.
Here, '冬将軍' is personified, likening the cold winter to an enemy one prepares to confront.
冬将軍との戦いに備えて、暖かいコートを買った。
I bought a warm coat to prepare for the battle against General Winter.
In this example, '冬将軍' suggests the particularly harsh conditions of this year's winter compared to other years.