Definitions from Wiktionary (sinkhole)

▸ noun:  (geology) A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
▸ noun:  A depressed area in which waste or drainage collects.
▸ noun:  (pinball) A hole in the playfield that rewards the player when the ball is guided into it.
▸ noun:  (Internet) A domain name server that has been configured to hand out non-routeable addresses for all domains, so that every computer that uses it will fail to get access to the real website.
▸ noun:  (computer security) An attack which redirects requests, whether network or memory accesses, to a new location defined by the attacker.
▸ verb:  (Internet, transitive) To configure as a sinkhole (domain name server that gives non-routeable addresses).

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