American Heritage Dictionary
(8)
Century Dictionary
(19)
GNU Webster's 1913
(5)
WordNet
(3)
Elsewhere on the web
The referee's not called a ruck, I'm on my feet and I've got a hand on the ball.— The Guardian World News
ALMOST total dominance in the ruck was the catalyst for a boilover at ANZ Stadium in Sydney on Saturday night, where the Swans handed Hawthorn a 38-point defeat.— AFL Latest News and Broadband
With White lifting in the ruck, the Swans responded with a withering burst of goals through Jarred Moore, O'Keefe, Malceski and Hall.— AFL Latest News and Broadband
Care was given his marching orders by referee Craig Joubert after barging in to the back of Ireland prop Marcus Horan at a ruck, an act of petulance that has drawn great scorn from fans and commentators alike.— Rugby news from Scrum.com
His snipes around the ruck area and his ability to chime in with tries from dummy-half have been features of his performances, especially in the latter half of the season.— The Roar - Your Sports Opinion

American Heritage Dictionary (2)
Century Dictionary (8)
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Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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