Who is bilingual?
1. I'm native English speaker. I speak English, also I can communicate with Germans. But The Germans sometimes say words I don't know, but I can understand what they mean even though they say that. Or, the Germans can explain me about that word.
2. I'm native Spanish speaker. I can speak English a bit. My tongue often gets twisted when I speak English, also I often become dumb once a Native English speaker speaks something in English. Sometimes I can't understand even though a Spanish speaks something even with simple Spanish words.
3. I'm German, and I can speak Polish a bit. But I can't tell my opinion when the Polish talk about politic, social topic and so on. Because I don't know many Polish words. I only know basic words.
4. I'm French. I'm fluent in French. I can understand/say Ciao bella, Buon giorno, Buona giornata, Hola, Hallo... But I can't speak the languages except them.
I wonder what's the standard of real bilingual.