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Meaning of knee brace

knee' brace"

Pronunciation: [key]
— Building Trades. Building Trades.
  1. a diagonal member for bracing the angle between two joined members, as a stud or column and a joist or rafter, being joined to each partway along its length.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.