brake a leg
[brake a leg] {v. phr.}Is said to actors for good luck before they go on stage, especially on an opening nights
One of the interpretations of "break a leg" is wishing to "make a strenuous effort".
تقال للمثلين قبل صعودهم على المسرح
وفي رواية اخرى تطلب بذل جهود مضنية