Synonyms of plug away

Verb

1. plug away, peg away, slog, keep one's nose to the grindstone, keep one's shoulder to the wheel, work

usage: work doggedly or persistently; "She keeps plugging away at her dissertation"

2. plug, plug away, persevere, persist, hang in, hang on, hold on

usage: persist in working hard; "Students must plug away at this problem"