pegar
to stick
peg
to fasten with a peg
+
-ar
verb suffix
Pegar means to stick and can be thought of as peg0 (to fasten0) + -ar1 (verb suffix1).
verb
  1. to stick
    To stick or glue something
    Voy a pegar estas fotos en el álbum. // I'm going to stick these photos in the album.
  2. to hit
    To hit or strike someone or something
    No debes pegar a tus compañeros de clase. // You shouldn't hit your classmates.