Definition & Meaning of "downer"in English

What is a "downer"?

A downer a drug or medication that calms or relaxes the central nervous system, leading to relaxation, sleepiness, or a decrease in physical and mental activity. These substances can create a calming effect or reduce anxiety. It is important to know that "downer" is not a clinical term and is often used informally to refer to drugs that produce these effects.