Dip it. Just pass it around in your hands, closed and pet it while you review your purpose of 'knowing' or 'mastery' of the language at hand.

Then spontaneously open here and there focusing on words and definitions... close it and go write out something you were going to write anyway. Or go use those words in conversation.

Repeat, from time to time.

For preview; concentrate on the pages concerning grammar and then hold the idea of mastery while casually flipping about through the body of the dictionary.

Let the 'idea' in, allow it to be 'real for you' that you can have PhotoReading a dictionary for you, now, even now.