plug away

Verb
  1. Work doggedly or persistently (synset 202420703)
    "She keeps plugging away at her dissertation"
    is a type of: work - exert oneself by doing mental or physical work for a purpose or out of necessity
    same as: keep one's nose to the grindstone, keep one's shoulder to the wheel, peg away, slog
  2. Persist in working hard (synset 200351920)
    "Students must plug away at this problem"
    is a type of: hang in, hang on, hold on, persevere, persist - be persistent, refuse to stop
    same as: plug

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