sentar
sit
seat
seat
+
-ar
verb suffix
Sentar means to sit and can be thought of as seat0 + -ar1 (verb1), literally meaning 'to seat' oneself.
verb
  1. sit
    To sit; to seat
    Por favor, siéntate en esta silla. // Please, sit in this chair.
  2. suit
    To suit; to become
    Ese color te sienta muy bien. // That color suits you very well.