enseñar
teach
en-
in, into
+
señal
sign, signal
+
-ar
verb suffix
Enseñar means to teach. It can be broken down into en-0 (in, into0) + señal1 (sign, signal1) + -ar2 (verb suffix2). Think of teaching as putting signals or signs into someone's mind.
verb
  1. teach
    To impart knowledge to or instruct someone
    Me gusta enseñar español a estudiantes extranjeros. // I like to teach Spanish to foreign students.