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

Edges chip easily, so visually scan the inside of lids and the underside to guarantee everything is intact. — Jennifer Prince, Southern Living, 18 Aug. 2026

The best testing locations include the underside of the base, the inside of a flap, the back of a strap, and a low section near a seam. — Olivia McIntosh, Martha Stewart, 17 Aug. 2026

In 1840, shade-loving Croomia, which cultivates flowers on the underside of its leaves, was included as a native species. — Candace Barone, Florida Times-Union, 15 Aug. 2026

Guests at Brookfield Zoo can identify her in Dolphin Bay by her distinctive features, including faint white lines along the sides of her head and chest, pink coloration on the underside of her slender rostrum, and gray ventral side. — Adam Harrington, CBS News, 13 Aug. 2026