Google Bowling
By studying what types of ranking manipulations a search engine is punishing, a company can provoke a search engine into lowering the ranking of a competitor's website. This practice, known as Google bowling, is often done by purchasing Google bombing services (or other SEO techniques) not for one's own website, but rather for the website of the competitor. The attacker provokes the search company into punishing the "offending" competitor by displaying their page further down in the search results. For victims of Google bowling, it may be difficult to appeal the ranking decrease because Google avoids explaining penalties, preferring not to "educate" real offenders. However if the situation is clear-cut, Google could lift the penalty after submitting a request for reconsideration.
Read more about this topic: Google Bomb