sinkhole

Short definition from Wiktionary

Noun

1. 1
   A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
2. 2
   A depressed area in which waste or drainage collects.
3. 3
   A hole in the playfield that rewards the player when the ball is guided into it.
4. 4
   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.
5. 5
   An attack which redirects requests, whether network or memory accesses, to a new location defined by the attacker.

Verb

1. 1
   To configure as a sinkhole (domain name server that gives non-routeable addresses).