as in bottom
the side or part facing downward from something
the underside of the cat's coat is pure white
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Recent Examples of underside
This layer traps moisture up against the underside of the mower, inviting rust.
—
David Beaulieu, The Spruce, 11 Feb. 2026
Plants that are already stressed indoors or grown in overcrowded conditions with poor airflow are more likely to develop fungal issues, like damping off or plant edema (lesions on the underside of leaves).
—Lauren Landers, Better Homes & Gardens, 8 Feb. 2026
The vehicle can load and unload cargo from its front and drop it from its underside, allowing for flexible logistics maneuvers and operations.
—Chris Young, Interesting Engineering, 3 Feb. 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
See All Example Sentences for underside
David Beaulieu, The Spruce, 11 Feb. 2026
Plants that are already stressed indoors or grown in overcrowded conditions with poor airflow are more likely to develop fungal issues, like damping off or plant edema (lesions on the underside of leaves).
—Lauren Landers, Better Homes & Gardens, 8 Feb. 2026
The vehicle can load and unload cargo from its front and drop it from its underside, allowing for flexible logistics maneuvers and operations.
—Chris Young, Interesting Engineering, 3 Feb. 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
See All Example Sentences for underside
Recent Examples of Synonyms for underside
bottom
Noun
-
An additional hit of white arrives via the tongue tag, and blue nylon pull tabs appear at its top and bottom and again at the heel.—
Ian Servantes,
Footwear News,
18 Feb. 2026
-
Su Yiming sat in the snow at the bottom of the snowboarding course, tears rolling down his cheeks.—
ABC News,
ABC News,
18 Feb. 2026
Cite this Entry
“Underside.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underside. Accessed 21 Feb. 2026.
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