as in underside
the side or part facing downward from something
the bird's underparts were white
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Recent Examples of underpart
Calliope hummers have glossy green on the back and crown with white underparts.
—
Joan Morris, The Mercury News, 26 July 2019
The adult brown pelican has gray underparts with brown hues, black-brown belly, yellow head and dark brown neck, silver-gray back and wings, with black feathers at the tips.
—Ernie Cowan, San Diego Union-Tribune, 13 June 2019
Joan Morris, The Mercury News, 26 July 2019
The adult brown pelican has gray underparts with brown hues, black-brown belly, yellow head and dark brown neck, silver-gray back and wings, with black feathers at the tips.
—Ernie Cowan, San Diego Union-Tribune, 13 June 2019
Recent Examples of Synonyms for underpart
Noun
-
Narratives Waymo provided on other collisions include one in which a speed bump hit the underside of one of its vehicles on southbound I-35 Frontage Road near East 51st Street.—
Andrea Guzmán,
Austin American Statesman,
18 Feb. 2026
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Its green leaves have a silvery underside for beautiful dimension, while the flowers are white, showy, and fragrant.—
Madeline Buiano,
Martha Stewart,
17 Feb. 2026
Noun
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An additional hit of white arrives via the tongue tag, and blue nylon pull tabs appear at its top and bottom and again at the heel.—
Ian Servantes,
Footwear News,
18 Feb. 2026
-
Su Yiming sat in the snow at the bottom of the snowboarding course, tears rolling down his cheeks.—
ABC News,
ABC News,
18 Feb. 2026
Cite this Entry
“Underpart.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underpart. Accessed 26 Feb. 2026.
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