Etymology
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downtime (n.)

also down-time, 1952, "time when a machine or vehicle is out of service or otherwise unavailable;" from down (adj.) + time (n.). Of persons, "opportunity for rest and relaxation," by 1982.

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Definitions of downtime

downtime (n.)
a period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions);
From wordnet.princeton.edu