title: How to disable a mode specified key-binding in Emacs
body: <p>I installed <a href="https://github.com/smihica/emmet-mode" rel="nofollow">emmet-mode</a>. </p>
  
  <p>The default key binding for <code>emmet-expand-line</code> is <code>C-j</code>.
  But I want to use <code>C-i</code> for it. And <code>C-j</code> for <code>newline</code> function.</p>
  
  <p>I can do with following elisp.</p>
  
  <pre><code>(define-key emmet-mode-keymap (kbd "C-i") 'emmet-expand-line)
  (define-key emmet-mode-keymap (kbd "C-j") 'newline)
  </code></pre>
  
  <p>But if possible I don't want to use this "overwriting" way.
  Is there way to "disable" a particular key binding in a mode?</p>