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Longman Dictionary of Contemporary English
trial run
noun
EXAMPLES FROM OTHER ENTRIES
▪ The airline's new check-in system will be given a trial run this weekend.
EXAMPLES FROM CORPUS
▪ After hearing of the consumer law from friends, Mr Wang decided to stage a trial run.
▪ Because this was the contraption's trial run, it was to be driven manually by turning the big wheel.
▪ But after a trial run, what do her passengers think of the ride?
▪ Cherrie advises against leading edge technology and even with what is regarded as a technological winner he recommends a trial run.
▪ The web site proved to be a bit bulky and tough to maneuver during a weeknight trial run....
▪ Thursday dawned crisp and sunny, perfect weather for a trial run, but I still chickened out!
▪ Use a smooth four-ply yarn and you can attach it to an old test piece for a trial run.
Wiktionary
trial run

n. A test of the suitability or effectiveness of a person or thing (a tryout)

WordNet
trial run

n. trying something to find out about it; "a sample for ten days free trial"; "a trial of progesterone failed to relieve the pain" [syn: trial, test, tryout]

Wikipedia
Trial Run

Trial Run is a 1969 TV series following a young lawyer, his adoring secretary, and his employer, a famed lawyer. This show was released January 18, 1969.

Usage examples of "trial run".

But let her have a day here at least, observing, then perhaps tomorrow she can try a trial run in the seat with me standing by.

The trial run was without incident, the test pilot pronouncing the craft airworthy.

The Caine steamed smoothly on the trial run, and Keefer said he was willing and anxious to take part in the next operation.

The weekend before the conference, as a trial run before discharge, Mary Megan had gone home on an overnight.