have one's work cut out

/HH AE1 V W AH0 N EH0 S W ER0 K AH0 T AW0 T/
verb
  1. 1

    To face a large task or project.

    โ€œIf he plans to translate all the idioms, he has his work cut out for him.โ€

Source: https://en.wiktionary.org/wiki/have%20one's%20work%20cut%20out, https://en.wiktionary.org/wiki/have%20one's%20work%20cut%20out%20for%20one