Duolingo is huge, counting over 170 Million users around the world. You can study over 20 different languages on Duolingo, but over 50% of users are studying English.
Many students ask, is Duolingo a good way to become fluent in English. The answer is not so simple. There are positive and negative aspects to the popular language-learning app.
A portmanteau word is a words that is made by combining two other words.
Portmanteau is a French word (pronounced /pɔːtˈmantəʊ/ in English) for a big suitcase that can hold many things. Because these words "hold" more than one other word inside them they were called portmanteaus by Lewis Carroll, the writer of Through the Looking Glass, who enjoyed using them in his writing).