Hey everyone, my brother asked me (“I’ve just started learning some Japanese” apparently translates, “I’m the Japanese language God incarnated”) what なんくるないさ means and looking around a bit (translated with Rikaichan and google search) I couldn’t tell if it’s kind of a proverb/canned phrase or if it’s just some common expression to say “don’t worry”.
Sorry if this is a shit question and thank you for your time ^-^