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 of underside

• 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 busy section of road had been closed since July 13, when a truck traveling east clipped the underside of the span. — Joseph Flaherty, Arkansas Online, 30 July 2026

Divers captured video footage of Galápagos sharks approaching manta rays and deliberately rubbing parts of their bodies, especially their heads, gill regions and sides, against the mantas’ undersides. — Melissa Cristina Márquez, Forbes.com, 28 July 2026

The underside holds two disks, each with six blades, that are powered by two 180W cutting motors. — John R. Delaney, PC Magazine, 28 July 2026

Cantore’s goal off the underside of the crossbar in the 61st minute helped the Spirit overcome the loss of four players involved in the Women’s Africa Cup of Nations. — ABC News, 27 July 2026

Word History

First Known Use

1660, in the meaning defined at sense 1

Rhymes for underside

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

Kids Definition

underside

noun

un·​der·​side ˈən-dər-ˌsīd 

ˌən-dər-ˈsīd

: the side or part lying underneath