Grind down

verb

Definitions

Verb
  1. 1
    To make something hard smaller and smoother by gradually rubbing off tiny bits; to wear down by grinding action. transitive

    "The old dog's teeth had been ground down by constant use."

  2. 2
    rule a country as a tyrant wordnet
  3. 3
    To weaken someone's morale over a long period. idiomatic, transitive

    "Djokovic broke twice in each of the opening two sets, dismantling 6ft 8in Anderson's service game and grinding him down in the rallies."

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