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
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Cleaning pro Trish Duarte says this method works well for the underside of blades, blade edges, and the light figure part.—
Emily Benda Gaylord,
The Spruce,
16 Apr. 2026
-
Look for larvae on the undersides of leaves.—
Karen Brewer Grossman,
Southern Living,
16 Apr. 2026
Noun
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With the Yankees down a run in the bottom of the ninth, Jose Caballero lined a two-RBI walkoff double into left-center field off of Jordan Romano to give the Bombers a comeback 5-4 win.—
James O'Connell,
New York Daily News,
16 Apr. 2026
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The cozy fleece bottoms have a flattering straight-leg fit and feature subtle side piping, giving them a fashionable, sporty effect.—
Melony Forcier,
PEOPLE,
15 Apr. 2026
Cite this Entry
“Underpart.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underpart. Accessed 18 Apr. 2026.
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