The word is generally accepted to mean a combination of function and sparkle, hence, farkle. Motorcycle enthusiasts may install accessories, called farkles (also spelled farkel), to customize their machine. One source attributes the term to Pete Wells, the organizer of a 1997 Honda ST1100 rally.
Instability is the quality of not being stable, balanced, or predictable. If you've ever walked out onto a diving board, you've probably noticed its instability â meaning the board bends and bounces as you move. Instability comes from the Middle French word instabilite, meaning unsteadiness.. Instability can refer to objects that are not stable, but it can also describe unpredictable situations or relationships. For example, you might hear people talk about economic instability.
Slump, in geology, downward intermittent movement of rock debris, usually the consequence of removal of buttressing earth at the foot of a slope of unconsolidated material. It commonly involves a shear plane on which a back-tilting of the top of the slumped mass occurs. The plane is slightly concave upward and outward and separates the slump block from unslumped material of the same character. In sedimentary strata the slumping material generally bends elastically until the rock strength is exceeded, when it breaks and moves rapidly. See also sedimentary structure.