This is the 13539th most frequent Polish word.
piersią
The Polish word "piersią" means "with the breast" or "by the breast" (instrumental form of "pierś").
The word 'piersią' refers to breastfeeding and is associated with the act of feeding with the breast.
Karmiła dziecko piersią.
She was breastfeeding the baby.
Here, 'piersią' metaphorically represents the chest as an emotional area or state.
Przyjęła jego słowa z ciężkim sercem i zamkniętą piersią.
She accepted his words with a heavy heart and a closed chest.
In this usage, 'piersią' denotes the physical chest as part of the body.