From Longman Dictionary of Contemporary Englishtrialstrials[plural] British EnglishDS a special sports competition in which people who want to be on a team are tested, so that the best can be chosen SYN tryout American Englishhorse/sheepdog trials (=a sporting competition in which horses or dogs compete) → trial
Examples from the Corpus
horse/sheepdog trials• There are famous horse trials at Badminton, 38 miles away.• They'd misjudged a fence at the Tythrop Park horse trials at Kingsey in Buckinghamshire. 