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 underside is pure cotton and feels a bit more delicate, almost silky. — Yelena Moroz Alpert, Architectural Digest, 13 July 2026

Regularly check the undersides of leaves and around the base of plants for signs of pests or diseases like powdery mildew. — Mary Marlowe Leverette, Southern Living, 13 July 2026

The box clicks into the seat's underside, with the wires neatly concealed between the base and the back support bar. — Will Greenwald, PC Magazine, 9 July 2026

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