In use Meaning, Definition & Usage

  1. adjective satellite (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)
    busy; engaged.
    • her line is busy
    • receptionists' telephones are always engaged
    • the lavatory is in use
    • kept getting a busy signal
  2. adjective satellite currently being used
    • robots are in use throughout industry

WordNet


Definitions
  1. . (a) In employment; in customary practice observance. (b) In heat; said especially of mares. J. H. Walsh.

Webster 1913