ни пуха ни пера

Phrase

 * 1) good luck, break a leg

Usage notes

 * Rather than thanking, the traditional response to this is, it's supposed to bring luck.
 * The meaning of the phrase is approximately "(I hope) you will not get a single feather," as would be spoken to a bird hunter, with usage and meaning akin to the English phrase "break a leg" and the German "Hals- und Beinbruch!".
 * The literal meaning is "Neither down nor feathers".