work (one's) butt off

Translations
работать до изнеможения
She worked her butt off to make the event successful.
Она работала до изнеможения, чтобы сделать мероприятие успешным.
Definitions
To work extremely hard or put in a great deal of effort to achieve something.
Words
work

verb
работать
one

pronoun
свой
is

functional word
есть
butt

noun
зад
off

adverb
прочь