The English idiom "Break a leg!" (meaning "Good luck!") does not translate literally into Indonesian.
Idioms are culturally embedded metaphors. "Break a leg" likely originates from theater superstition (saying "good luck" is bad luck; wishing the opposite). Indonesian culture has no equivalent leg-breaking superstition. Direct translation conveys the opposite meaning.
Lesson: Always translate pragmatic intent, not literal words. Use "Semoga berhasil!" for "Break a leg!" in Indonesian contexts.