The word 'hacks up' carries a negative connotation, indicating an act of destroying or damaging something. The antonyms for this term would be positive words that express the opposite meaning. Words like preserve, maintain, build, create, repair, and restore would be suitable antonyms for 'hacks up'. These words suggest a constructive and positive approach towards dealing with something. Preservation and maintenance express the act of keeping something in a good condition for a longer period, while building, creating and restoring denote the act of constructing, crafting or fixing something. Therefore, using such antonyms can provide a positive way of expressing ideas in contrast to the destructive implications of 'hacks up'.