Polite word for sweat. To pass liquid through the skin. (Cambridge Dictionary)
To emit matter through the skin. (Merriam – Webster)
When you perspire, a liquid comes out on the surface of your skin, because you are hot or frightened. (Collins Dictionary)
Give out sweat through the pores of the skin as a result of heat, physical exertion, or stress. (Oxford Dictionaries)
Why do we perspire on a hot day?
Perspire. Your Dictionary.