In this part of the story, Meno and Socrates further discuss what is virtue. Meno thinks Socrates is like the flat torpedo sea-fish, but Socrates still uses a way to ask a slave to Meno to prove that he is right.
So that he who does not know about any matters, whatever they be, may have true opinions on such matters, about which he knows nothing?
And at this moment those opinions have just been stirred up in him, like a dream; but if he were repeatedly asked these same questions in a variety of forms, you know he will have in the end as exact an understanding of them as anyone.
So it seems.
In Socrates’ view, anyone has a real opinion of one thing, even though they may not understand it.