“Knock” in Polish is “pukać,” but you’d never know that the word even exists in the language, for many Poles (around here at least) have a habit of literally walking into your house unannounced. Or they knock once and walk in without waiting.
It can lead to some particularly embarrassing situations, as you might imagine: walking in when someone’s taking a nap, for example.
And it’s not just friends and acquaintances that do this. The first time I was here, a lady going door-to-door selling apples tried to walk in after a single, quiet knock. Fortunately, my door was locked (a habit I quickly acquired), for I was just changing clothes.
And then for some friends, it was difficult to explain why I always knock.