Synonyms of underside

underside

noun

ˈən-dər-ˌsīd 

as in bottom

the side or part facing downward from something

the underside of the cat's coat is pure white

Synonyms & Similar Words

• bottom
• undersurface
• floor
• seat
• underbelly
• underpart
• foot
• underbody
• belly
• sole
• toe
• base
• ground
• underpinning
• undercarriage

Antonyms & Near Antonyms

• top
• face
• roof
• apex
• crest
• height
• crown
• peak
• pinnacle
• summit
• meridian
• climax
• head
• tip
• culmination
• point
• zenith
• acme
• cusp
• high-water mark
• tip-top

Example Sentences

Recent Examples of underside

With squid, baitfish, and predators all swimming fast and changing colors in the lights, the underside of the boat must have looked like a rave party. — Matthew Every, Outdoor Life, 8 July 2026

The ballista spider spends its days lurking in webs on the undersides of leaves in the rainforests of north Queensland, Australia. — The Week Uk, TheWeek, 6 July 2026

The two pedestal tables store in pouches on the underside of the sofas, and the sofa benches themselves fold up and back against the wall. — New Atlas, 3 July 2026

Working with 1 cookie at a time, spread 1 tablespoon vanilla glaze over half of underside of cookie. — ABC News, 29 June 2026