Definition of trial run in English:

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trial run

noun

A preliminary test of how a new system or product works: the police used Sunday’s US Cup game as a trial run for next year’s games
More example sentences
  • With the experience of the trial run, they hope to fine tune the system and make it fool proof, so that passengers using the facility will not be disappointed.
  • Two members of the operational team, it went on to say, had evaded security checks during a recent trial run at an unidentified New York airport.
  • I am therefore going to run an experimental trial run next week, from Monday March 24 to Sunday March 30.

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