bottleneck

Noun
  1. A narrowing that reduces the flow through a channel (synset 113936007)
  2. The narrow part of a bottle near the top (synset 102881107)
Verb
  1. Slow down or impede by creating an obstruction (synset 202563728)
    "His laziness has bottlenecked our efforts to reform the system"
  2. Become narrow, like a bottleneck (synset 200305727)
    "Right by the bridge, the road bottlenecks"

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