I had a conversation with a colleague last week, he's a native French speaker, I'm a native German speaker. We switched between French, German and English, ever

I had a conversation with a colleague last week, he's a native French speaker, I'm a native German speaker. We switched between French, German and English, every time we had a problem expressing what we wanted to say in a language and then continuing the conversation a little in another language before switching again. That's a form of code-switching. What you do is using phrases and words that you learned without speaking the language they're borrowed from. Sometimes borrowing words even limits the meaning, when you say "Gesundheit" you don't mean the general concept of health, you mean "bless you". If I asked you to translate et cetera you would probably not be able to unless you spoke Latin.