definition of
bottleneck

[1] #1 bottleneck n. [constriction, chokepoint] a narrowing that reduces the flow through a channel. wn

[2] #2 bottleneck v. slow down or impede by creating an obstruction; "His laziness has bottlenecked our efforts to reform the system". wn

[3] #3 bottleneck n. the narrow part of a bottle near the top. wn

[4] #4 bottleneck v. become narrow, like a bottleneck; "Right by the bridge, the road bottlenecks". wn