writing off (a debt); cancellation; balancing the books / cancelling out (gains or losses); making even; making up (for); offsetting; undoing; wiping out

(Internet slang) act of deleting own tweet

(Internet slang) to delete own tweet

(video games) complete clearing

great-grandfather

great-grandfather, especially one's grandfather's father

great-grandfather

great-grandfather

paternal grandfather

work done for free, unpaid work, uncompensated work / work done in vain, work with no favorable end result