kończ waść, wstydu oszczędź

Etymology
lit. 'cut it out, save [me the] embarrassment'. From 's historical novel .

Usage notes
This popular phrase is often erroneously used with disregard for the context in which the words were originally said. Andrzej Kmicic, uttering these words, asked that he – the one uttering them – be spared the shame of losing a battle to his opponent, Michał Wołodyjowski. Thus, it is wrong to address someone with these words with the intention that they – the addressee – should stop disgracing themselves, since they are making numerous obvious mistakes. The phrase does not mean “stop compromising yourself” but rather “spare me further humiliation and let me go away with honor from a situation that makes me look ridiculous”. It is an admission of defeat and a willingness to suffer the consequences, as well as a request for some kind of mercy from the winner.