Looking up a word is a good start. Actually using it is what helps it stick.
Every word in Linguin's dictionary now has a Practice button. Tap it, and you'll jump straight into a conversation where that word comes up naturally. Reply however you like, by typing or speaking, and use the word in a real context instead of just reading its definition.
The goal is simple: moving a word from recognition to active use. A short conversation does that much better than reading the same definition again.
Like every conversation in Linguin, you'll get feedback at the end to help you understand what you did well and where you can improve.
Next time you look up a word, tap Practice and give it a try.