D defs.my
Entry 1 sense Webster, 1913

Tumbling

/tŭm'-bəl-ĭng/ · Tum·bling · IPA /tˈʌmbəlɪŋ/
01 a. & vb. n. a. & vb. n. from Tumble, v.
  1. 1.
    a. & vb. n. from Tumble, v. See: Tumble
Phrases & compounds
Tumbling barrel — Same as Rumble, n., 4.
Tumbling bay — an overfall, or weir, in a canal.