The phrase "if it kills you" is often used to express determination to achieve a goal at any cost. There are several synonyms that can be used to convey this same message. For example, one might say they will "do whatever it takes" or "persist until the end." Similarly, one might say they are "driven by a singular focus" or "single-minded in their pursuit." Alternatively, one might say they will "fight tooth and nail" or "give it their all." No matter which synonym is used, the message remains the same: the individual in question is committed to reaching their goal, even if it means facing significant challenges or obstacles along the way.