This is the 11632nd most frequent Polish word.
klawisz
The Polish word "klawisz" can mean "key" (on a keyboard or instrument) or colloquially, "prison guard."
In this context, 'klawisz' refers to a key on a keyboard or electronic device.
Naciśnij klawisz Escape, aby zamknąć to okno.
Press the Escape key to close this window.
Here, 'klawisz' denotes a key on a musical instrument like a piano.
Ten pianista zdecydowanie używa każdego klawisza z wielkim wyczuciem.
This pianist definitely uses each key with great sensitivity.
In this contextual use, 'klawisz' is slang for a prison guard or officer.