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

On the dark underside of the 59-second Bigfoot film lies a tawdry family drama. — Owen Gleiberman, Variety, 18 Oct. 2026

Relatively warm ocean water can melt the underside of these floating shelves. — Kaif Shaikh, Interesting Engineering, 17 Oct. 2026

Storyteller Overland Storyteller also enhances the rear’s role as a storage garage, adding MOLLE-style organizational panels to the underside of the bed. — New Atlas, 15 Oct. 2026

The right temple features a multipurpose rocker and action button on the underside, near the hinge, with an additional button on the top side. — Will Greenwald, PC Magazine, 15 Oct. 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