against (one's) will
Without one's permission or consent. Typically used to describe an action or activity that one has been forced to do. The attacker forced the woman into his car against her will.
against one's will
Without one's consent, forcibly, as in The defendant knew he could not be made to testify against his will. Originally one meaning of will was "acquiescence" or "consent," but this sense survives only in this idiom, which today nearly always implies some use of force. [c. 1400]