Which term refers to the act of holding back or suppressing something forcibly?

The term that refers to the act of holding back or suppressing something forcibly is "quell." This word specifically captures the meaning of putting an end to something, such as unrest, rebellion, or emotions, through force or authority. When one quells a situation, they are actively working to reduce or eliminate it, often because it is seen as undesirable or disruptive.

In contrast, other terms do not convey the same sense of suppression. For instance, "quench" typically means to satisfy a thirst or extinguish a flame, which does not relate to the act of suppression. "Pristine" describes something that is untouched or in its original condition, and is unrelated to the notion of holding back. The word "prostate" refers to a gland and does not pertain to suppression or control of any kind. Thus, "quell" is the most appropriate term for the described action.