Definitions from Wiktionary ( )

▸ noun:  The narrow portion that forms the pouring spout of a bottle; the neck of a bottle.
▸ noun:  (music) A portion of a bottleneck placed on the finger and used as a guitar slide.
▸ noun:  (figurative) In traffic, any narrowing of the road, especially resulting in a delay.
▸ noun:  (by extension) The part of a process that is too slow or cumbersome.
▸ verb:  (transitive) To slow by causing a bottleneck.
▸ verb:  (intransitive) To form a bottleneck.

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