enfermar
to get sick
enfermo
sick
+
-ar
verb suffix
Enfermar means to get sick and can be broken down into enfermo0 (sick0) + -ar1 (verb suffix1), literally meaning 'to become sick'.
verb
  1. to get sick
    To become ill or sick
    Si no te abrigas, puedes enfermar. // If you don't dress warmly, you might get sick.