talk down

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb idiomatic To negotiate a lower price.
• verb idiomatic To speak condescendingly or as though the listener is inferior.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb belittle through talk
• verb direct and control (the flight of an airplane during landing) via radio
• verb speak in a condescending manner, as if to a child