perspire UK /pəˈspaɪə(ɹ)/US /pɚˈspaɪɹ/ verb3 •To emit (sweat or perspiration) through the skin's pores.I was perspiring freely after running the marathon. •To be evacuated or excreted, or to exude, through the pores of the skin.A fluid perspires. •(rare) To cause (someone) to sweat.Outside his window a long, humid summer, the first hot season of the third millennium, baked and perspired. — 2001 formsperspired · perspiring · perspires