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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Officials said victims should also place any uneaten portions of a mushroom in a paper bag or waxed paper and refrigerate it or take photos of the cap, stem and underside to help medical experts identify the toxin.—
Alexandra Koch,
FOXNews.com,
13 May 2026
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The spray button is located on the underside of the iron’s handle and can be used during both dry and steam ironing, provided there is water in the tank.—
BestReviews,
Mercury News,
13 May 2026
Noun
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Montgomery played a factor in the bottom of the fifth with a one-out single.—
LaMond Pope,
Chicago Tribune,
14 May 2026
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The back of Cy Young Award finalist Hunter Brown’s jersey is visible at the bottom.—
Chandler Rome,
New York Times,
13 May 2026
Cite this Entry
“Underpart.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underpart. Accessed 18 May. 2026.
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