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tumbling-room
tumbling-room n. 
/ˈtʌmblɪŋrʊm/, /ˈtʌmbl̩ɪŋruːm/, /ˈtʌmbl̩ɪŋrʊm/, /ˈtəmb(ə)lɪŋˌrʊm/ space for tumbling; spec. a room in which a tumbling-box is set up.
Brit. /ˈtʌmblɪŋruːm/
, /ˈtʌmblɪŋruːm//ˈtʌmblɪŋrʊm//ˈtʌmbl̩ɪŋruːm//ˈtʌmbl̩ɪŋrʊm/U.S. /ˈtəmb(ə)lɪŋˌrum/
, /ˈtəmb(ə)lɪŋˌrum//ˈtəmb(ə)lɪŋˌrʊm/ΘΠ
the world > space > [noun] > sufficient space or room > room to live, move, or work > for other specific actions
tumbling-room1860
stretching-room1895
1860 G. Meredith Evan Harrington viii, in Once a Week 10 Mar. 222/2 No tumbling-room for the wine.
1901 Trans. Amer. Inst. Electr. Engin. 562 (Cent. Supp.).
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