Sometimes I remember a word or a phrase in another language, and I've forgotten the definition, but somehow I still know what it means, because the word/phrase itself evokes something.
Like "khush", something about the word said happy to me.
Or "me hace falta", and I felt like I was missing something, even though I remembered that "to miss" is "extranar".
And maybe it's something about language (or about me), that when I forget it actually means I know better.