break (a) leg

Translations
ни пуха ни пера
Before the performance, she told him to break a leg.
Перед выступлением она пожелала ему ни пуха ни пера.
Definitions
An idiomatic expression used to wish someone good luck, especially before a performance or presentation. It is often used in the performing arts as a way to avoid directly saying 'good luck,' which is considered bad luck.
Words
break

verb
сломай
a

article or possessive pronoun
одну
leg

noun
ногу