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for·swearalso fore·swear (fôr-swâr′)
v. for·swore (-swôr′), for·sworn (-swôrn′), for·swear·ing, for·swears
a. To decide or declare that one will not or will no longer engage in (an activity or habit, for example): a political group that has forsworn violence.
b. To decide or declare that one will not or will no longer use or be associated with (something): "He had cast in his lot with the lions and forsworn the lambs" (Robert Louis Stevenson).
c. To disavow under oath: "He was forced to take an oath forswearing heretical views" (Garry Wills).
2. To make (oneself) guilty of perjury.
To swear falsely; commit perjury
To commit perjury.
[Middle English forsweren, from Old English forswerian : for-, wrongly; see for- + swerian, to swear; see swear.]