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

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

At the same time, the bull directs a spray of urine onto the underside of his neck and then rolls about in the wallow after it is dug, continuing to urinate in the wallow. — Alex Robinson, Outdoor Life, 12 Aug. 2026