A suppressant is a drug that holds down some bodily activity you want less of. The word almost never travels alone — it comes attached to what it is stopping: an *appetite suppressant* makes you feel less hungry, a *cough suppressant* quiets a cough, an *immune suppressant* (more often *immunosuppressant*) damps down the body's defences after a transplant. It is a pharmacy-and-label word rather than a chatty one; at home people just say "cough medicine" or "diet pills." Notice the honest shape of the meaning: a suppressant pushes a symptom down, it does not cure the cause. A cough suppressant does not clear the infection, and that is exactly why a doctor may not want you taking one — sometimes the cough is doing useful work. Stress the middle: sup-PRESS-ant.

抑制劑（例：食慾抑制劑、止咳藥／鎮咳劑）