random walk
— Noun
– English
~ a stochastic process consisting of a sequence of changes each of whose characteristics (as magnitude or direction) is determined by chance
retaining wall
— Noun
– English
~ a wall that is built to resist lateral pressure (especially a wall built to prevent the advance of a mass of earth)
rock wallaby
— Noun
– English
~ slender long-legged Australian wallabies living in caves and rocky areas