plug away
Verb
Meaning
work doggedly or persistently
persist in working hard
Source: WordNetSynonyms
plug
slog
peg away
keep one's nose to the grindstone
bullock
drudge
work
continue
labour
travail
labor
slave
struggle
dig
persist
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Antonyms
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Examples
She keeps plugging away at her dissertation
Students must plug away at this problem