"bottlenecks" in the noun sense
1. constriction, bottleneck, chokepoint
a narrowing that reduces the flow through a channel
2. bottleneck
the narrow part of a bottle near the top
"bottlenecks" in the verb sense
1. bottleneck
slow down or impede by creating an obstruction
"His laziness has bottlenecked our efforts to reform the system"
2. bottleneck
become narrow, like a bottleneck
"Right by the bridge, the road bottlenecks"
Source: WordNet® (An amazing lexical database of English)
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