bottle neck

名词 bottle neck:

1. a narrowing that reduces the flow through a channel
   同义词：constriction, bottleneck, chokepoint
2. the narrow part of a bottle near the top
   同义词：bottleneck

动词 bottle neck:

1. slow down or impede by creating an obstruction
   同义词：bottleneck
2. become narrow, like a bottleneck
   同义词：bottleneck