Observe an unknown word used a few times in different contexts, and you'll get a very good bead on what it means.
It's the "natural" way of learning a language. No one gets every word explained to them in detail - most words you know in your own first language are the ones you picked up on the go.
I think this "structural redundancy" might be a big part of what enables LLMs to learn human languages "from nothing".
Looking at the first Frieren example:
"Live without [fear]", "Live without [bread]", "Live without [sunlight]", "Live without [honour]". The common words are more than enough to set up a generic sentence for lack of something but then what someone lacks can be literally any object, concept or verb. There are a lot more than 500 of those in the world.
Maybe words are the wrong thing to delineate by, I mean even if you haven’t heard the word ‘circumnavigate’ you can probably deduce its meaning especially with context.
Before that point, you are probably going to have too much trouble generalizing.
>What could make this wrong: >1. "Understood" means you know every word. It ignores grammar, kanji readings, speaking speed and context.
Other than language learners. If you want to learn someone's language, read their comic books. They have pictures.