This is the 17180th most frequent Polish word.
zacisnął
"Zacisnął" means "he/she/it clenched" or "tightened."
Here, 'zacisnął' means 'clenched' and is used to describe the physical act of tightly closing one's fists.
Zacisnął pięści z determinacją.
He clenched his fists with determination.
In this sentence, 'zacisnął' describes the act of tightly closing lips, demonstrating restraint or self-control.
Kiedy go obrażali, zacisnął usta, by nie powiedzieć nic nieuprzejmego.
When they insulted him, he pursed his lips not to say anything disrespectful.
Here, 'zacisnął' indicates clenching one's teeth, often signifying persistence or enduring discomfort.