Definitions for work at
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Princeton's WordNet
work at, work on(verb)
to exert effort in order to do, make, or perform something
"the child worked at the multiplication table until she had it down cold"
Kernerman English Learner's Dictionary
work at(verb)ɜrk
to put a lot of effort into achieving sth
Being patient is something I really have to work at.
Wiktionary
work at(Verb)
To make a physical or mental effort to progress some specified task
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