tight five
US /ˌtaɪt ˈfaɪv/
UK /ˌtaɪt ˈfaɪv/
1.
a group of five players in a rugby union scrum, consisting of two props, a hooker, and two locks
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The coach emphasized the importance of a strong tight five for winning scrums.
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A dominant tight five can set the platform for attacking plays.