over- +‎ tax


overtax (third-person singular simple present overtaxes, present participle overtaxing, simple past and past participle overtaxed)

  1. To tax to an excessive degree
  2. To overburden
    The overtaxed shaft snapped.
    • 1963 January, “New in Japan: Tokaido line trials”, in Modern Railways, page 44:
      The 310-mile Tokaido line is being built from Tokyo to Osaka, through the most densely populated and heavily industrialised area of the country, to relieve the existing 340-mile 3ft 6in gauge line, which is overtaxed by continually increasing traffic.