Wow! I've never seen this online dictionary before. A handful of years ago, I stopped asking students to provide the dictionary definition of their vocabulary words on their Frayer model word maps. Instead, I provided the definition, and asked them to put it in their own words. I didn't want students spending the majority of their time looking up the definition. This isn't where the learning happens. But honestly, some students even had trouble putting it in their own words, so maybe a website like Collins Cobuild dictionary could help those students really simplify the definitions.
