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

The underside of its wings are honey yellow and with rusty red with black patches, according to the study. —Lauren Liebhaber july 8, Miami Herald, 8 July 2025

Forming a slowly spreading colony of 24-inch-tall, gracefully arching stems, plants produce lightly fragrant white spring flowers that hang like little white bells from the underside of each stem. —Paul Cappiello, The Courier-Journal, 2 July 2025

The power button is located on the underside of the plinth. —New Atlas, 2 July 2025

In addition, good airflow from under the eaves or soffit area along the underside of the roof and out through the roof vents is essential. —Chad Murphy, The Enquirer, 2 July 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