bottlenecks

/B AA1 T AH0 L N EH0 K S/
noun
  1. 1

    The narrow portion that forms the pouring spout of a bottle; the neck of a bottle.

  2. 2

    In traffic, any narrowing of the road, especially resulting in a delay.

  3. 3

    (by extension) The part of a process that is too slow or cumbersome.

    โ€œIt is easy to create entries; processing the paperwork is the bottleneck.โ€

verb
  1. 1

    To slow by causing a bottleneck.

    โ€œThe merge bottlenecked the traffic every morning.โ€

  2. 2

    To form a bottleneck.

    โ€œThe traffic bottlenecked at the merge every morning.โ€

Source: https://en.wiktionary.org/wiki/bottleneck, https://en.wiktionary.org/wiki/bottlenecks