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See more synonyms for underside on Thesaurus.com
  1. an under or lower side.
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Origin of underside

First recorded in 1670–80; under- + side1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for underside

Contemporary Examples

Historical Examples

  • He laid the phone down and looked to the underside viewscreen.

    Space Viking

    Henry Beam Piper

  • As he turned it over in his hand he observed some lettering on the underside.

    The Hand in the Dark

    Arthur J. Rees

  • The warriors were on the underside, and Henry fell upon them.

    The Eyes of the Woods

    Joseph A. Altsheler

  • Upon the underside of one of its sleeves there is a big ink blob.

    Sundry Accounts

    Irvin S. Cobb

  • The wire should now be protected from touching the bird on its underside.

    Practical Taxidermy

    Montagu Browne

British Dictionary definitions for underside


  1. the bottom or lower surface
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for underside


c.1680, from under + side (n.). Cf. Dutch onderzijde, Danish underside, German unterseite.

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Online Etymology Dictionary, © 2010 Douglas Harper