Give something up as a bad job - Idioms by The Free Dictionary
give something up as a bad job
give something up as a bad job decide that it is futile to devote further time and energy to something. informal
2005 Theresa Green A Quiet Crusade Sixth was startled to such a degree that he actually got up out of his basket and followed Maddie around for almost ninety seconds before giving it up as a bad job and going back to bed.
give somebody/something up as a bad ˈjob (informal) decide that it is impossible to do something or to change somebody and then stop trying to do it: ‘Are you still studying Japanese?’ ‘No, I gave it up as a bad job. It was far too difficult for me!’