bottleneck
1. [ noun ] a narrowing that reduces the flow through a channel
Synonyms: constriction chokepoint
Related terms: narrowing
2. [ verb ] slow down or impede by creating an obstruction
Examples:

"His laziness has bottlenecked our efforts to reform the system"

Related terms: obstruct
3. [ verb ] become narrow, like a bottleneck
Examples:

"Right by the bridge, the road bottlenecks"

Related terms: narrow constriction
Similar spelling:   bottlenose
  botulin
  botulinus
  botulinum
  botulinal