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DictionarybugTechnical fault
noun

bug

A fault that prevents software, equipment, or a system from working correctly.

The programmer finds a bug in the calculation.

Etymology
bugEnglishinsect; troublesome creature

The insect name became a figurative name for a troublesome fault in machinery. Computing inherited that usage; it was already established before the famous moth found in a computer.

More examples

  • Several bugs delayed the release.
  • The bug caused the screen to freeze.
  • They fixed the most serious bug.

Forms

bug · bugs

debug verb — Find and fix faults in software.

Similar words

defect
Any flaw in a product or system.
error
A mistake or incorrect result, not necessarily the underlying fault.