This is the 11633rd most frequent Polish word.
klej
Glue.
In this sentence, 'kleju' refers to the substance used to adhere objects together.
Użyłem kleju, aby przykleić kartkę do tablicy.
I used glue to stick the sheet to the board.
Here, 'kleju' again refers to the adhesive material, emphasizing its performance qualities.
Potrzebujesz mocniejszego kleju, jeśli chcesz przykleić coś do szkła.
You need stronger glue if you want to stick something to glass.
In this sentence, 'klej' is used as a general term referring to adhesive substances and their forms.