From Longman Dictionary of Contemporary Englishdowntimedown‧time /ˈdaʊntaɪm/ noun [uncountable] 1 TDthe time when a computer is not working2 (also down time) informal a period of time when you have finished what you were doing, and you can relax or do something that you had not originally planned to do Often, during semesters, you have down time when you can do some exercise. —downtime adjective downtime activities for teachers
Examples from the Corpus
downtime• The group intends to have System V achieve a downtime of about five minutes a year by 1999.• They involve design, materials, coordination, downtime on equipment, and evaluation.• Anyone working in an office setting knows this is a period of extreme downtime when little gets done.• Needing less downtime than my subject, I have plenty of spare energy.• If the provider has a single connection to the outside world, ask how often it fails and the length of downtime.• They are relatively expensive items - but not compared to plant downtime.From Longman Business Dictionarydowntimedown‧time /ˈdaʊntaɪm/ noun [uncountable]1MANUFACTURING time lost in producing goods because something has gone wrong, for example because a machine has broken or materials have not arrivedloss of revenue due to downtimeWith less downtime at the plant, customers can start to expect significant savings.2COMPUTING time lost on a computer NETWORK (=a system of connected computers) because the system is not working properlyLast year alone, computer downtime cost the company $4,000 in lost productivity. 