mentalizar
prepare mentally
mental
relating to the mind
+
-izar
verb-forming suffix
Mentalizar means to prepare mentally and can be thought of as mental0 + -izar1 (verb-forming suffix1), literally meaning 'to make mental'.
verb
  1. prepare mentally
    To prepare mentally or psychologically
    Los atletas se mentalizan antes de la competición. // Athletes prepare mentally before the competition.