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tumbling stone
tumbling stone n. 
/ˈtʌmbl̩ɪŋ stəʊn/,
Brit. /ˈtʌmblɪŋ stəʊn/
, /ˈtʌmblɪŋ stəʊn//ˈtʌmbl̩ɪŋ stəʊn/U.S. /ˈtəmb(ə)lɪŋ ˌstoʊn/
a loose stone embedded in clay; a boulder: = tumbler n. 8./ˈtəmb(ə)lɪŋ ˌstoʊn/ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > [noun] > a rock > boulder
stonerockeOE
rochec1300
rocka1413
calionc1459
outlier1610
boother1680
tumbler1789
boulder1815
lost stone1819
erratic blocka1828
erratic blocka1828
lost rock1831
gibber1834
tumbling stone1857
foundling-stone1892
1857 J. Robertson in Charteris Life (1863) xii. 338 There are many sloughs and tumbling stones on the road.
1881 Borrings & Sinkings II. 2 (E.D.D.) Strong blue clay with large tumbling stones.
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