rock

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To move back and forth or from side to side, especially gently or rhythmically.
• intransitive verb To sway violently, as from a blow or shock. synonym: swing.
• intransitive verb To be washed and panned in a cradle or in a rocker. Used of ores.
• intransitive verb Music To play or dance to rock music.
• intransitive verb Slang To be excellent or outstanding. Used in exclamations of approval.
• intransitive verb To move (a child, for example) back and forth or from side to side, especially in order to soothe or lull to sleep.
• intransitive verb To cause to shake or sway violently. synonym: agitate.
• intransitive verb To disturb the mental or emotional equilibrium of; upset.
• intransitive verb To excite or cause strong feeling in, as by playing rock music.
• intransitive verb To wash or pan (ore) in a cradle or rocker.
• intransitive verb In mezzotint engraving, to roughen (a metal plate) with a rocker or roulette.
• noun A rocking motion.
• noun The act of rocking.
• noun Music A form of popular music characterized by electronically amplified instrumentation, a heavily accented beat, and relatively simple phrase structure. Originating in the United States in the 1950s, rock incorporates a variety of musical styles, especially rhythm and blues, country music, and gospel.
• idiom (rock the boat) To disturb the balance or routine of a situation.
• noun Relatively hard, naturally formed mineral or petrified matter; stone.
• noun A relatively small piece or fragment of such material.
• noun A relatively large body of such material, as a cliff or peak.
• noun A naturally formed aggregate of mineral matter constituting a significant part of the earth's crust.
• noun One that is similar to or suggestive of a mass of stone in stability, firmness, or dependability.
• noun Slang Money.
• noun Slang A large gem, especially a diamond.
• noun Slang Crack cocaine.
• noun A varicolored stick candy.
• noun Rock candy.
• idiom (between a rock and a hard place) Confronted with equally unpleasant alternatives and few or no opportunities to evade or circumvent them.
• idiom (on the rocks) In a state of difficulty, destruction, or ruin.
• idiom (on the rocks) Without money; bankrupt.
• idiom (on the rocks) Served over ice cubes.

from The Century Dictionary.

• To throw stones at; stone.
• noun A distaff used in hand-spinning; the staff or frame about which the flax or wool is arranged from which the thread is drawn in spinning.
• noun A young hedgehog.
• noun See roc.
• noun The mass of mineral matter of which the earth, so far as accessible to observation, is made up; a mass, fragment, or piece of that crust, if too large to be designated as a stone, and if spoken of in a general way without special designation of its nature.
• noun A stone of any size, even a pebble.
• noun A mass of stone forming an eminence or a cliff.
• noun Hence, in Scripture, figuratively, foundation; strength; asylum; means of safety; defense.
• noun A cause or source of peril or disaster: from the wrecking of vessels on rocks: as, this was the rock on which he split.
• noun A kind of hard sweetmeat, variously flavored.
• noun Same as rockfish, 1 .
• noun The rock-dove, Calumba livia, more fully called blue-rock.
• noun A kind of soap. See the quotation.
• noun A piece of money: commonly in the plural: as, a pocketful of rocks.
• noun A very hard kind of cheese, made from skimmed milk, used in Hampshire, England.
• noun Synonyms It is an error to use rock for a stone so small that a man can handle it: only a fabulous person or a demi-god can lift a rock.
• To move backward and forward, as a body supported below (especially on a single point, a narrow line, or a curved base); cause to sway upon a support: as, to rock a cradle; to rock a chair; sometimes, to cause to reel or totter.