descuidar
neglect
des-
un-, dis-
+
cuidar
to care for
Descuidar means to neglect and can be understood as des-0 (un- or dis-0) + cuidar1 (to care for1), literally meaning 'to un-care for' or 'to not take care of'.
verb
  1. neglect
    To neglect or fail to take care of something or someone
    No debes descuidar tus estudios. // You shouldn't neglect your studies.