sprung floor
n.— «One of the cooler aspects of this new auxiliary gym is it has what’s called a “sprung floor,” which helps takes the stress off of people’s legs while they’re here playing basketball or volleyball.» —“Inside the Phoenix’s New Fitness Center” by Adam Aaro WBAy-TV (Green Bay, Wisconsin) Sept. 19, 2007. (source: Double-Tongued Dictionary)
Further reading
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Default as a noun and default as a verb are the same word, with a familiar English stress shift: nouns often take first-syllable stress, while verbs often take second-syllable stress, as with the different pronunciations of record. A New York City...