trzeć.

to rub (to move a body part or a held object such that it touches some surface)

to rub against, to bump up against (to come into contact with something while in motion)

to grate, to shred (to chop up food items using a grater)

to saw, to cut (to cut with a saw)

to chafe, to pinch

to powder, to crush, to grind (to change hemp or grain into a powder)

to rub oneself

to rub each other

to spawn (to deposit eggs in water)

to rub up against (to argue, to quarrel)