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bot·tle·neck  (btl-nk)
a. A narrow or obstructed section, as of a highway or a pipeline.
b. A point or an area of traffic congestion.
2. A hindrance to progress or production.
3. The narrow part of a bottle near the top.
4. Music A style of guitar playing in which an object, such as a piece of glass or metal, is passed across the strings to achieve a gliding sound.
tr.v. bot·tle·necked, bot·tle·neck·ing, bot·tle·necks
To slow down or impede by creating an obstruction.

bottleneck [ˈbɒtəlˌnɛk]
1. (Engineering / Automotive Engineering)
a.  a narrow stretch of road or a junction at which traffic is or may be held up
b.  the hold up
2. something that holds up progress, esp of a manufacturing process
3. (Music / Pop Music) Music
a.  the broken-off neck of a bottle placed over a finger and used to produce a buzzing effect in a style of guitar-playing originally part of the American blues tradition
b.  the style of guitar playing using a bottleneck
(tr) US to be or cause an obstruction in

bottleneck  (btl-nk)
An abrupt and severe reduction in the number of individuals during the history of a species, resulting in the loss of diversity from the gene pool. The generations following the bottleneck are more genetically homogenous than would otherwise be expected. Bottlenecks often occur in consequence of a catastrophic event.

bottleneck  /btlnk/  n. 1 a narrow part of a road, passageway, etc.: The four-lane road narrows into a bottleneck as you get near the city. 2 fig. a place where an activity slows or stops: An accident on the road caused a bottleneck in traffic. bottleneck

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