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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On many of the planes, the boom operator works lying face down while looking out of a window on the underside of the plane.—
Kim Tong-Hyung,
Los Angeles Times,
13 Mar. 2026
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These generally appear as white bumps or specks that encrust the stems, branches, and undersides of leaves and suck the sap.—
Steve Bender,
Southern Living,
10 Mar. 2026
Noun
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Venezuela cut its deficit in half in the bottom of the first on a Willson Contreras RBI single against Marlins ace Sandy Alcantara that plated Maikel Garcia, who hit an infield single and moved to second on a Luis Arraez walk.—
Jordan McPherson,
Miami Herald,
12 Mar. 2026
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Cardiff finished bottom of the Premier League in the 2013-14 campaign, before Caulker again suffered relegation from the top flight with Queens Park Rangers the following season.—
Jay Harris,
New York Times,
12 Mar. 2026
Cite this Entry
“Underpart.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underpart. Accessed 13 Mar. 2026.
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