Word Origin & History
rock (n.)
"stone," O.E. rocc (in stanrocc "stone rock or obelisk"), also from O.N.Fr. roque, from M.L. rocca (767), from V.L. *rocca, of uncertain origin, sometimes said to be from Celtic (cf. Bret. roch). Seems to have been used in M.E. principally for rock formations as opposed to individual stones. Meaning "precious stone, especially a diamond," is 1908, U.S. slang. Fig. use for "sure foundation" (especially with ref. to Christ) is from 1526. Meaning "crystalized cocaine" is attested from 1973, in West Coast U.S. slang. Rocks "ice cubes" is from 1946; slang meaning "testicles" is first recorded in phrase get (one's) rocks off "achieve intense satisfaction." On the rocks "ruined" is from 1889. Rock-bottom "lowest possible" is from 1856. Rock-salt is from 1707. Between a rock and a hard place first attested 1921, originally in Arizona. Rock-ribbed is from 1776, originally of land; fig. sense of "resolute" first recorded 1887.