Etymology
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bottleneck (n.)

also bottle-neck, "narrow entrance, spot where traffic becomes congested," 1896; from bottle (n.) + neck (n.). Meaning "anything which obstructs a flow" is from 1922; the verb in this sense is from 1928.

updated on March 05, 2015

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Definitions of bottleneck from WordNet
1
bottleneck (v.)
slow down or impede by creating an obstruction;
His laziness has bottlenecked our efforts to reform the system
bottleneck (v.)
become narrow, like a bottleneck;
Right by the bridge, the road bottlenecks
2
bottleneck (n.)
a narrowing that reduces the flow through a channel;
Synonyms: constriction / chokepoint
bottleneck (n.)
the narrow part of a bottle near the top;
From wordnet.princeton.edu, not affiliated with etymonline.