Bottleneck

n. narrow section at the top of a bottle; hindrance to the clear flow of traffic, traffic jam; impediment to progress

v. stop, delay, hinder movement, delay traffic

Bottleneck may refer to:Bottleneck (engineering)Bottleneck (logistics)Bottleneck (traffic)Bottleneck guitar, also known as slide guitarFree State Bottleneck, a quasi-state that existed in Germany during the time of the Weimar RepublicPopulation bottleneck, an evolutionary event that drastically reduces a populationVon Neumann bottleneck, a limit of throughput between a computer's processor and its memoryChoke point, a concept in military strategy and geopoliticsThe top part of a bottle
See more at Wikipedia.org...

Noun
1. a narrowing that reduces the flow through a channel
(synonym) constriction, chokepoint
(hypernym) narrowing
Verb
1. slow down or impede by creating an obstruction; "His laziness has bottlenecked our efforts to reform the system"
(hypernym) obstruct, blockade, block, hinder, stymie, stymy, embarrass
2. become narrow, like a bottleneck; "Right by the bridge, the road bottlenecks"
(hypernym) narrow, contract
(derivation) constriction, chokepoint

n. bottleneck, stop, delay, hinder movement, delay traffic

A drastic reduction in the population size followed by an expansion. This often results in altered gene pool as a result of genetic drift.