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From on- +‎ cost, or from Middle English uncost (additional expense), from Middle Dutch oncost (expenses, overhead) (Modern Dutch onkost), equivalent to un- +‎ cost. Cognate with German Unkost (expenses).


oncost (plural oncosts)

  1. Additional costs; extra expenses.
  2. (finance) Overhead (expense)
  3. (coal-mining) The cost of upkeep, making and maintaining shafts, roads, pumping, etc.
  4. (Britain dialectal, Scotland) The indirect expenditure incurred for the purpose of increasing the productive power of organised labour.