This is the 15143rd most frequent Polish word.
rękawa
"Rękawa" is the genitive singular or accusative plural form of "rękaw," which means "sleeve" in English.
The word "rękawa" is in the genitive case (possessive form) indicating ownership or association with the "kurtka" (jacket). It refers to the sleeve of the jacket.
Mam dziurę w rękawie mojej kurtki.
I have a hole in the sleeve of my jacket.
Here, "rękawa" is used metaphorically, in the genitive case, to represent cleverness or trickery during the card game, implying a hidden card was revealed from the sleeve.
Wyciągnąłem asa z rękawa podczas gry w karty.
I pulled an ace out of my sleeve during the card game.
"Rękawa" describes the sleeve of a shirt and is used in the genitive case, showing a relationship between the stain and the shirt's sleeve.