underside

noun

un·​der·​side ˈən-dər-ˌsīd 

ˌən-dər-ˈsīd

1

: the side or surface lying underneath

2

: a side usually hidden from sight

specifically : the more unpleasant or reprehensible side

the underside of politics

Synonyms

• bottom

Examples of underside in a Sentence

the underside of the table

The book explores the underside of human nature.

Recent Examples on the Web

Clasp the underside of your thighs with both hands, hinge back, and lift your feet until your lower legs are parallel to the floor. —Health Editorial Team, Health, 28 Aug. 2025

However, their use isn’t limited to just the TV; try adding them to the underside of your bed frame for some cozy lighting beneath your bed as well. —Brittney Morgan, Travel + Leisure, 25 Aug. 2025

It’s squished between two thick pieces of bread that hold up well, with sliced pickles on the underside, lettuce on top, and a spread of ranch sauce on either side. —Shaun Goodwin, Idaho Statesman, 22 Aug. 2025

And use a disinfectant to clean the underside of your tables and bar tops, to avoid dust, grime, and other nasty germs from touching your legs and clothes. —Daley Quinn, Southern Living, 21 Aug. 2025

Word History

First Known Use

1660, in the meaning defined at sense 1

Rhymes for underside

• actinide
• aldehyde
• alkoxide
• alongside
• amplified
• arsenide
• beautified
• biocide
• butoxide
• calcified
• ceramide
• certified

Kids Definition

underside

noun

un·​der·​side ˈən-dər-ˌsīd 

ˌən-dər-ˈsīd

: the side or part lying underneath