overwork - definition and synonyms

verb 

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/ˌəʊvə(r)ˈwɜː(r)k/
present tense
I/you/we/theyoverwork
he/she/itoverworks
present participleoverworking
past tenseoverworked
past participleoverworked
  1. 1
    [transitive] to make someone work harder than is reasonable

    Staff complained that they were being overworked.

    1. a.
      [intransitive] to work harder than you should
  2. 2
    [transitive] to use or do something so much that it is no longer effective