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

Two people were injured when a semi-trailer truck hauling steel beams hit the underside of the Lake Avenue bridge over the Edens Expressway near Wilmette on Thursday evening. — Todd Feurer, CBS News, 18 Sep. 2026

The snakes are named for their distinctive yellow underside, which contrasts dramatically with their darker top half. — Fedor Zarkhin, Los Angeles Times, 17 Sep. 2026

Engineers who separately examined the building’s exterior supposedly found widespread corrosion in structural components of the soffit panels along the underside of an overhang that wraps around the center. — Francesca Aton, ARTnews.com, 14 Sep. 2026

This male bird’s lemon-yellow underside is adorned with fine black streaks that form a necklace across its breast. — Literary Hub, 9 Sep. 2026