This is the 13589th most frequent Polish word.
pięści
"Pięści" means "fists" in English.
Here, 'pięści' is used to describe fists as clenched hands, indicating an emotional state (anger).
Chłopiec zaciskał pięści w gniewie.
The boy clenched his fists in anger.
In this context, 'pięści' refers to the physical hands used in boxing, emphasizing strength and capability.
Musisz mieć silne pięści, aby zostać bokserem.
You need to have strong fists to become a boxer.
Here 'pięścią' (instrumental case of 'pięść') is used to describe the act of hitting with a fist, focusing on the action performed.