This is the 3642nd most frequent Polish word.
gru
The Polish word "gru" refers to the Russian military intelligence agency, GRU.
In this sentence, 'gru' refers to the month of December, which is traditionally associated with winter weather.
Gru w Polsce jest mroźna i śnieżna.
Winter in Poland is cold and snowy.
Here, 'gru' is part of the word 'gruszka', meaning pear, showcasing that 'gru' itself can be part of larger words.
Czy wiesz, kto używa gruszek do ćwiczeń?
Do you know who uses pears for exercises?
In this context, 'gru' is part of the word 'gruz', meaning debris or rubble, again emphasizing its role as part of composite words.