How to use dictionary look up on websites that prevent it? Typically, I triple-tap to search up a word or bring up an apple dictionary. Some websites, however, prevent this. Is there anyway I can override this? I am using Chrome. An example website would be membean.com during a vocab training session.
Assuming I understand your question correctly, you should be able to use the context menu to select the Look Up option.

More specifically:


In your browser double-click on a word to select it
Then right-click (or use ctrl+click) to bring up the context menu (e.g. if you double-click on the word house to select it and then right-click on it, you'll see a context menu such as:





From this menu you can select the top Look Up option and then you'll get the dictionary definition.