rip

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

• intransitive verb To cut, tear apart, or tear away roughly or energetically. synonym: tear.
• intransitive verb To cause to be pulled apart, as by an accident.
• intransitive verb To split or saw (wood) along the grain.
• intransitive verb Computers To copy (audio or audio-visual material from) a CD or DVD.
• intransitive verb To subject to vehement criticism or attack.
• intransitive verb Informal To produce, display, or utter suddenly.
• intransitive verb Vulgar Slang To expel (a discharge of intestinal gas).
• intransitive verb To become torn or split apart.
• intransitive verb Informal To move quickly or violently.
• noun The act of ripping.
• noun A torn or split place, especially along a seam.
• noun A ripsaw.
• idiom (let it/'er) To allow something to start or happen with vigor or energy.
• noun A dissolute person.
• noun An old or worthless horse.
• noun A stretch of water in a river, estuary, or tidal channel made rough by waves meeting an opposing current.
• noun A rip current.

from The Century Dictionary.

• noun A vicious, reckless, and worthless person; a “bad lot”: applied to a man or woman of vicious practices or propensities, and more or less worn by dissipation.
• noun A worthless or vicious animal, as a horse or a mule.
• noun An implement for sharpening a scythe. Compare rifle.
• noun A ridge of water; a rapid.
• noun A little wave; a ripple; especially, in the plural, ripples or waves formed over a bar or ledge, as when the wind and tide are opposed.
• To separate or divide the parts of by cutting or tearing; tear or cut open or off; split: as, to rip open a sack; to rip off the shingles of a roof; to rip up the belly; especially, to undo (a seam, as of a garment), either by cutting the threads of it or by pulling the two pieces of material apart, so that the sewing-thread is drawn out or broken.
• To drag or force out or away, as by cutting or rending.
• Figuratively, to open or reopen for search or disclosure; lay bare; search out and disclose: usually with up. See ripe.
• To saw (wood) in the direction of the grain. See rip-saw.
• To rob; pillage; plunder.
• Synonyms Tear, Cleave, etc. See rend.
• To be torn or split open; open or part: as, a seam rips by the breaking or drawing out of the threads; the ripping of a boiler at the seams.
• To rush or drive headlong or with violence. [Colloq.]
• A dialectal form of reap. Halliwell.
• noun A rent made by ripping or tearing; a laceration; the place so ripped.
• noun A rip-saw.
• noun A wicker basket in which to carry fish.
• To break forth with violence; explode: with out.
• To utter with sudden violence; give vent to, as an oath: with out.
• noun A handful of grain not thrashed.

from the GNU version of the Collaborative International Dictionary of English.

• noun A rent made by ripping, esp. by a seam giving way; a tear; a place torn; laceration.
• noun Slang. A term applied to a mean, worthless thing or person, as to a scamp, a debauchee, or a prostitute, or a worn-out horse.
• noun A body of water made rough by the meeting of opposing tides or currents.
• transitive verb To divide or separate the parts of, by cutting or tearing; to tear or cut open or off; to tear off or out by violence; ; -- commonly used with up, open, off.
• transitive verb To get by, or as by, cutting or tearing.
• transitive verb To tear up for search or disclosure, or for alteration; to search to the bottom; to discover; to disclose; -- usually with up.
• transitive verb To saw (wood) lengthwise of the grain or fiber.
• transitive verb (Carp.) a crooked chisel for cleaning out mortises.