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The Collaborative International Dictionary
Underbear

Underbear \Un`der*bear"\, v. t. [AS. underberan. See Under, and Bear to support.]

  1. To support; to endure. [Obs.]
    --Shak.

  2. To line; to guard; to face; as, cloth of gold underborne with blue tinsel. [Obs.]
    --Shak.

Wiktionary
underbear

vb. 1 To support, endure. 2 (context transitive English) To line, guard or face a material, especially cloth.