Definitions:

1. Refers to tinkering with or making incremental progress on a task, project, or code, commonly used in programming or engineering. VERB
   • We've been hacking on this new software feature all week.
2. Suggests keeping at a task, often informally or with effort. VERB
   • He's been hacking on his novel every evening after work.
3. To nag, annoy, or repeatedly criticize someone about something. VERB
   • She keeps hacking on him about finishing his homework.

Synonyms:

• criticize
• keep at
• nag
• tinker with
• Work on