Simple past tense and past participle of showcase.(verb)
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Use "showcased" in a sentence
"However, I've been surprised how much McCain showcased the young lad."
"The exhibit, which will feature authors such as William Blake, Lord Byron and John Keats, will make its debut at the library at 6 p.m. today and remain showcased until the end of the December."
"His semifinal victory over Henman again showcased his aggressive baseline game and what he calls "the never-say-die attitude.""