Verb
The word is derived from forswear
of Forswear
imp. of Forswear.
Source: Webster's dictionaryDamascus was a major trading centre that abounded in wealth and was under normal circumstances a potential threat, but the rulers of Jerusalem had recently entered into a truce with the city, which they then forswore. Source: Internet
In the 1990s, Lem forswore science fiction and returned to futurological prognostications, most notably those expressed in Blink of an Eye (OkamgnienieSUBST). Source: Internet