ни пуха ни пера

• ни пу́ха! (ni púxa!)

• IPA^(key): [nʲɪ‿ˈpuxə nʲɪ‿pʲɪˈra]

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ни пу́ха ни пера́! • (ni púxa ni perá!)

1. good luck, break a leg

• Rather than thanking, the traditional response to this is к чёрту! (k čórtu!, “to the devil!”), 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".