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
-
Don’t forget to check stems and the undersides of leaves.—
Gemma Johnstone,
The Spruce,
29 Jan. 2026
-
An Italian Tricolore flag on the underside of the pop-up rear spoiler is the finishing touch.—
Tim Pitt,
Robb Report,
28 Jan. 2026
Noun
-
Early in the conversation, Louis Walsh's hand moves from across the top of the couch behind Mel B to her bottom.—
Angela Andaloro,
PEOPLE,
28 Jan. 2026
-
Black shimmering sequins featured around the neckline and at the cuffs of the sleeves and at the bottom of the top, as well.—
Julia Teti,
Footwear News,
28 Jan. 2026
Cite this Entry
“Underpart.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underpart. Accessed 2 Feb. 2026.
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