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Sudar vs. transpirar

Both sudar and transpirar are Spanish verbs that translate to to sweat in English. However, they can be used in slightly different contexts.

Sudar

A2
Sudar directly translates to to sweat in English. This term is often used in everyday speech to describe the physical act of sweating.
Estoy sudando debido al calor del sol.
(I am sweating due to the heat of the sun.)
Ella suda mucho cuando hace ejercicio.
(She sweats a lot when she exercises.)

Transpirar

B2
Transpirar can also translate to to sweat. However, it tends to be used in more scientific or medical contexts, much like perspire would be used in English.
Las plantas transpiran agua a través de sus hojas.
(Plants perspire water through their leaves.)
La fiebre alta te hará transpirar más.
(High fever will make you perspire more.)

Summary

Sudar and transpirar both translate as ‘to sweat’. While sudar is commonly used in everyday language to describe physical sweating, 'transpirar’ is more suitable in scientific or medical contexts.