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

Engineers who separately examined the building’s exterior supposedly found widespread corrosion in structural components of the soffit panels along the underside of an overhang that wraps around the center. — Francesca Aton, ARTnews.com, 14 Sep. 2026

This male bird’s lemon-yellow underside is adorned with fine black streaks that form a necklace across its breast. — Literary Hub, 9 Sep. 2026

Allan Saint-Maximin led a counterattack and found Abada, who sent a powerful shot off the underside of the crossbar and into the net. — ABC News, 9 Sep. 2026

Look on the undersides of leaves and branch intersections for signs of pests. — The Spruce, 8 Sep. 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