I. ˈrə-bəl noun
Etymology: Middle English robyl
Date: 14th century
1.
a. : broken fragments (as of rock) resulting from the decay or destruction of a building
fortifications knocked into rubble — C. S. Forester
b. : a miscellaneous confused mass or group of usually broken or worthless things
2. : waterworn or rough broken stones or bricks used in coarse masonry or in filling courses of walls
3. : rough stone as it comes from the quarry
II. transitive verb
( rub·bled ; rub·bling -b(ə-)liŋ)
Date: 1926
: to reduce to rubble