underside

[ uhn-der-sahyd ]
/ ˈʌn dərˌsaɪd /

noun

an under or lower side.

Origin of underside

First recorded in 1670–80; under- + side1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for underside

underside

/ (ˈʌndəˌsaɪd) /

noun

the bottom or lower surface

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