clearly isn't everything!"
"I don't know what you mean," Harry said.
Severus Snape smiled contemptuously. "Of course you don't, idiot
boy. I meant 'there's a nice knock-down argument for you!' "
"But 'Fame clearly isn't everything' doesn't mean 'a nice knock-down
argument for you,' " Harry objected.
"When I use words," Snape said, in rather a scornful tone, "they
mean just what I choose them to mean - neither more nor less."
"The question is, " said Harry, "whether you can make words
mean so many different things."
"The question is," said Snape, "which is to be master -