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1. to cease from, leave off, or discontinue: to stop running.

2. to cause to cease; put an end to: to stop noise in the street.

3. to interrupt, arrest, or check (a course, proceeding, process, etc.): Stop your work just a minute.

4. to cut off, intercept, or withhold: to stop supplies.

5. to restrain, hinder, or prevent (usually fol. by from ): I couldn't stop him from going.

6. to prevent from proceeding, acting, operating, continuing, etc.: to stop a speaker; to stop a car.

7. to block, obstruct, or close (a passageway, channel, opening, duct, etc.) (usually fol. by up ): He stopped up the sink with a paper towel. He stopped the hole in the tire with a patch.

8. to fill the hole or holes in (a wall, a decayed tooth, etc.).

9. to close (a container, tube, etc.) with a cork, plug, bung, or the like.

10. to close the external orifice of (the ears, nose, mouth, etc.).

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A clock is an instrument used to indicate, measure, keep, and co-ordinate time. The word clock is derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning "bell". For horologists and other specialists the term clock continues to mean exclusively a device with a striking mechanism for announcing intervals of time acoustically, by ringing a bell, a set of chimes, or a gong. A silent instrument lacking such a mechanism has traditionally been known as a timepiece. In general usage today a "clock" refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one's person are often distinguished from clocks.

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Urban decay is the process whereby a previously functioning city, or part of a city, falls into disrepair and decrepitude. It may feature deindustrialization, depopulation or changing population, economic restructuring, abandoned buildings, high local unemployment, fragmented families, political disenfranchisement, crime, and a desolate, inhospitable city landscape.

North American cities often experience population flights to the suburbs and exurb commuter towns, i.e., white flight. Another characteristic of urban decay is blight—the visual, psychological, and physical effects of living among empty lots, buildings and condemned houses. Such desolate properties are socially dangerous to the community because they attract criminals and street gangs, contributing to the volume of crime.

Urban decay has no single cause; it results from combinations of inter-related socio-economic conditions—including the city’s urban planning decisions, the poverty of the local populace, the construction of freeway roads and rail road lines that bypass the area, depopulation by suburbanization of peripheral lands, real estate neighborhood redlining, xenophobic immigration restrictions, and racial discrimination.

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The incandescent light bulb, incandescent lamp or incandescent light globe is a source of electric light that works by incandescence (a general term for heat-driven light emissions, which includes the simple case of black body radiation). An electric current passes through a thin filament, heating it to a temperature that produces light. The enclosing glass bulb contains either a vacuum or an inert gas to prevent oxidation of the hot filament. Incandescent bulbs are also sometimes called electric lamps, a term also applied to the original arc lamps.

Incandescent bulbs are made in a wide range of sizes and voltages, from 1.5 volts to about 300 volts. They require no external regulating equipment and have a low manufacturing cost, and work well on either alternating current or direct current. As a result the incandescent lamp is widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting.

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A weed in a general sense is a plant that is considered by the user of the term to be a nuisance, and normally applied to unwanted plants in human-made settings such as gardens, lawns or agricultural areas, but also in parks, woods and other natural areas. More specifically, the term is often used to describe native or nonnative plants that grow and reproduce aggressively. Generally, a weed is a plant in an undesired place.

Weeds may be unwanted for a number of reasons: they might be unsightly, or crowd out or restrict light to more desirable plants or use limited nutrients from the soil. They can harbor and spread plant pathogens that infect and degrade the quality of crop or horticultural plants. Some weeds are a nuisance because they have thorns or prickles, some have chemicals that cause skin irritation or are hazardous if eaten, or have parts that come off and attach to fur or clothes.

The term weed in its general sense is a subjective one, without any classification value, since a "weed" is not a weed when growing where it belongs or is wanted. Indeed, a number of "weeds" have been used in gardens or other cultivated-plant settings. An example is the corncockle, Agrostemma, which was a common field weed exported from Europe along with wheat, but now sometimes grown as a garden plant.