work at

Verb
  1. To exert effort in order to do, make, or perform something (synset 202420169)
    "the child worked at the multiplication table until she had it down cold"
    is a type of: work - exert oneself by doing mental or physical work for a purpose or out of necessity
    subtypes: belabor, belabour - to work at or to absurd length
    same as: work on

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