for·swear 
/foɚˈsweɚ/ verb
for·swears; for·swore /foɚˈsweɚ/ verb /-ˈswoɚ/ for·sworn /-ˈswoɚn/ for·swear·ing [+ obj] formal : to promise to give up (something) or to stop doing (something)
▪ She forswore her allegiance to the old regime. ▪ He foreswore cigarettes/smoking as his New Year's resolution.
▪ She forswore her allegiance to the old regime. ▪ He foreswore cigarettes/smoking as his New Year's resolution.
