1 [mass noun] the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil:the beds of rock are slightly tilteda piece of rock [as modifier]:a spectacular rock arch
[count noun] a mass of rock projecting above the earth’s surface or out of the sea:there are dangerous rocks around the island
[count noun] Geology any natural material, hard or soft (e.g. clay), having a distinctive mineral composition.
(the Rock) informal name for Gibraltar or (Canadian) Newfoundland.
2a large piece of rock which has become detached from a cliff or mountain; a boulder:the stream flowed through a jumble of rocks
North American a stone of any size:the crowd threw a few rocks and dispersed
[mass noun]British a kind of hard confectionery in the form of cylindrical peppermint-flavoured sticks:a stick of rock
informal a precious stone, especially a diamond.
informal a small piece of crack cocaine:crack sells for $20 a rock [mass noun]:the police discovered six ounces of rock in his van
(rocks) vulgar slang a man’s testicles.
3used to refer to someone or something that is extremely strong, reliable, or hard:the Irish scrum has been as solid as a rock
4 (usually rocks) (especially with allusion to shipwrecks) a source of danger or destruction:the new system is heading for the rocks
5 (rocks) US informal, dated money.
between a rock and a hard place
informal faced with two equally undesirable alternatives:the alternative was equally untenable—she was caught between a rock and a hard place
get one's rocks off
vulgar slang have an orgasm.
obtain pleasure or satisfaction.
on the rocks
1(of a relationship or enterprise) experiencing difficulties and likely to fail:his marriage was on the rocks
2(of a drink) served undiluted and with ice cubes:he ordered a Scotch on the rocks
Middle English: from Old French rocque, from medieval Latin rocca, of unknown ultimate origin