in use

Adjective
  1. (of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability;
    (`engaged' is a British term for a busy telephone line) (synset 301627541)
    "her line is busy"; "receptionists' telephones are always engaged"; "the lavatory is in use"; "kept getting a busy signal"
  2. Currently being used (synset 302504834)
    "robots are in use throughout industry"

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