Dictionary & Thesaurus

plug away

1.	(verb) work doggedly or persistently; "She keeps plugging away at her dissertation"
	Synonyms: peg away, slog
	Related Words: work

2.	(verb) persist in working hard; "Students must plug away at this problem"
	Synonyms: plug
	Related Words: hang in, hang on, hold on, persevere, persist