/ fɔːˈsweə(r); NAmE fɔːrˈswer/ verb
( for·swore / fɔːˈswɔː(r); NAmE fɔːrˈs-/, for·sworn / fɔːˈswɔːn; NAmE fɔːrˈswɔːrn/) [ vn ] ( formal or literary ) to stop doing or using sth; to make a promise that you will stop doing or using sth
SYN renounce :
The group forswears all worldly possessions.
The country has not forsworn the use of chemical weapons.
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WORD ORIGIN
Old English forswerian (from for- and swear ).