un·​der·​side | \ ˈən-dər-ˌsīd How to pronounce underside (audio) , ˌən-dər-ˈsīd \

Definition of underside

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 & Antonyms for underside



Visit the Thesaurus for More 

Examples of underside in a Sentence

the underside of the table The book explores the underside of human nature.
Recent Examples on the Web The telltale sign that mites are present is webbing on the underside of the lower leaves. Rita Perwich, San Diego Union-Tribune, 7 May 2022 American white pelicans have black flight feathers on the underside of their wings only visible when their wings are open. From Usa Today Network And Wire Reports, USA TODAY, 18 Apr. 2022 Next the purple color spread to the first true leaves right above the cotyledons and little bumps appeared on the underside of the purple leaves. oregonlive, 10 Apr. 2022 The girls slept in bunks: Lulu would push up hard with her feet on the underside of Charlotte’s mattress until Charlotte peered down crossly over the guardrail, telling her off. Tessa Hadley, The New Yorker, 21 Mar. 2022 The brand name Insignia is on the top or front of each unit, and a rating label can be found on the underside, identifying the brand and model number. Kate Gibson, CBS News, 21 Apr. 2022 One treatment for these is spraying with a jet of water on the underside, another is insecticidal soap and a third is Neem oil. oregonlive, 13 Feb. 2022 This darling3-year-old boy has an amazing coat, black with distinct shades of brown throughout and touches of a white underside. The Republic, The Arizona Republic, 25 Mar. 2022 The Air has several interesting aerodynamic elements—from a slight curvature to the underside of its battery pack to the passages through the hood—that aid both its impressively low 0.21 coefficient of drag as well as high-speed stability. Dave Vanderwerp, Car and Driver, 24 Mar. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'underside.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of underside

1660, in the meaning defined at sense 1

Learn More About underside

Time Traveler for underside

Time Traveler

The first known use of underside was in 1660

See more words from the same year

Dictionary Entries Near underside



under siege

See More Nearby Entries 

Statistics for underside

Last Updated

19 May 2022

Cite this Entry

“Underside.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underside. Accessed 28 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for underside


un·​der·​side | \ ˈən-dər-ˌsīd How to pronounce underside (audio) \

Kids Definition of underside

: the side or surface lying underneath the underside of a leaf

More from Merriam-Webster on underside

Nglish: Translation of underside for Spanish Speakers


Test Your Vocabulary

Name That Color

  • a light greenish blue color
  • Name that color:
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!