talk down to

talk down to idiom
Also, speak down to. Address someone with insulting condescension, patronize, as in Just because she's editor-in-chief doesn't give her the right to talk down to her staff, or Children hate teachers who speak down to them.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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