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

Whether that all becomes quick and routine largely depends on dark ceramic tiles covering Starship’s underside. — Sven Bilén, The Conversation, 29 Sep. 2026

Screws Before getting your cash out, make sure to turn the furniture over and check out its underside. — Shagun Khare, Martha Stewart, 28 Sep. 2026

Make small cuts through the main thick veins on the underside of the leaf, about a quarter of the way from the petiole (leaf stem). — Derek Carwood, Better Homes & Gardens, 27 Sep. 2026

Focus on the undersides of the leaves since aphids often hide out in those crevices. — Jane Kim, The Spruce, 26 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