Esperanto

krokodili- verb, literally something like “to crocodile”

It means when an Esperanto-speaker speaks in a language other than Esperanto while amongst other Esperanto-speakers.

No one’s quite sure why that’s the term for it, most likely because crocodiles have a big mouth.

When I learned that, it suddenly made a lot of sense why Duolingo taught me the word for “crocodile” so early.