He seemed confused until he 'twigged' that something was going on.
I had to explain it to him three times but he finally 'twigged'.
We should gather up small 'twigs' for the campfire.
(..) Show me. I am Groot. Tinkle in the cup. We're not looking. What's there to see? What's a twig? Everybody's seen a twig before. I am Groot. Tree, pour what's in the cup out into space and go in the cup again. (..)2018 Avengers: Infinity War