01 v. t. To support; to endure.
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1.
To support; to endure.[Obs.]
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2.
To line; to guard; to face; as, cloth of gold underborne with blue tinsel.[Obs.]
Entry
2 senses
Webster, 1913
Underbear
· Un·der·bear
· IPA /ˌʌndə(ɹ)ˈbɛə(ɹ)/