underside
noun
un·der·side
ˈən-dər-ˌsīd 
ˌən-dər-ˈsīd
1
: the side or surface lying underneath
2
: a side usually hidden from sight
specifically
: the more unpleasant or reprehensible side
the underside of politics
Examples of underside in a Sentence
the underside of the table
The book explores the underside of human nature.
Recent Examples on the Web
The fur on the rest of the body is dark to light brown above, with lighter fur on the underside.
—
Encyclopedia Britannica, 2 Apr. 2026
To achieve their audacious goals, the fish use hook-like growths on the undersides of both their pectoral and pelvic fins to push themselves upward.
—Andrew Paul, Popular Science, 2 Apr. 2026
Instead, females appear with golden-green coloring with a white underside, according to All About Birds.
—Lucia Cheng, Des Moines Register, 2 Apr. 2026
Leaves, Gupta said, are a tree’s air-conditioning system, or, through the stomata on their underside, its breathing and sweating mechanism.
—Pedro Moura, Los Angeles Times, 1 Apr. 2026
See All Example Sentences for underside
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Encyclopedia Britannica, 2 Apr. 2026
To achieve their audacious goals, the fish use hook-like growths on the undersides of both their pectoral and pelvic fins to push themselves upward.
—Andrew Paul, Popular Science, 2 Apr. 2026
Instead, females appear with golden-green coloring with a white underside, according to All About Birds.
—Lucia Cheng, Des Moines Register, 2 Apr. 2026
Leaves, Gupta said, are a tree’s air-conditioning system, or, through the stomata on their underside, its breathing and sweating mechanism.
—Pedro Moura, Los Angeles Times, 1 Apr. 2026
See All Example Sentences for underside
Cite this Entry
“Underside.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underside. Accessed 6 Apr. 2026.
Copy CitationKids Definition
underside
noun
un·der·side
ˈən-dər-ˌsīd
ˌən-dər-ˈsīd
: the side or part lying underneath
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