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

Spider Mites Spider mites can be challenging to see on your zinnias, but gossamer on the underside of the leaves or between the leaf and the stem is always a dead giveaway. — The Spruce, 21 July 2026

Look closely at the tops and undersides of the leaves, stems, leaf joints, and even the surface of the soil for insects, eggs, webbing, discoloration, or other signs of pests or disease. — Colleen Sullivan, Martha Stewart, 21 July 2026

Their wide toe straps have soft undersides with smooth edges that won’t pinch your skin or trigger blisters. — Sian Babish, PEOPLE, 19 July 2026

The underside is pure cotton and feels a bit more delicate, almost silky. — Yelena Moroz Alpert, Architectural Digest, 13 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