resfriar
catch a cold
re-
again, back
+
frío
cold
+
-ar
verb ending
Resfriar means to catch a cold. It can be thought of as re-0 (again0) + frío1 (cold1) + -ar2 (verb ending2), literally meaning 'to make cold again'.
verb
  1. catch a cold
    To catch a cold or become ill with a cold
    Me resfrié por salir sin abrigo en invierno. // I caught a cold from going out without a coat in winter.
  2. cool
    To cool down or make something cold
    Debes resfriar la sopa antes de servirla. // You should cool the soup before serving it.