N. + (이)나 => "just," "nothing else but . . ."

N. + (이)나

=> "just," "nothing else but . . ."

This construction has the meaning of "nothing better to do, so (I) will just . . ."

• 낮잠이나 잘까.
  => (There's not much to do.) Maybe I'll just take a nap.
  
• 방학동안 책이나 읽으려고 해.
  => I am just going to read books during the vacation.
  
• 심심해서 TV나 보기로 했다.
  => I was bored, and I decided just to watch TV.