Duolingo is the world's largest online language learning platform. It was recognized as Apple's iPhone App of the Year of 2013 as well as Google Play's Best of the Best of 2013 and 2014. Duolingo's adaptive experience has gamified elements to make language learning more fun and effective. 200 million students are learning a language with Duolingo.
Definition of waffle. : a crisp cake of batter baked in a waffle iron.
A waffle is a dish made from leavened batter or dough that is cooked between two plates that are patterned to give a characteristic size, shape and surface impression. There are many variations based on the type of waffle iron and recipe used.