Definition of "trialling" [trialling]

• Present participle of trial. (verb)
• The running of trial races, especially for horses or greyhounds (noun)

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• "The Conservatives said the idea of trialling the scheme in one city was "nonsensical"."
• "He said management had been "trialling" using only three pieces of identification: a driver's licence, passport and 18+ card."
• "He started trialling the system himself and the full switchover took about a week."