1
: the hollow beneath the junction of the arm and shoulder
2
: the least desirable place : pit
77th Street Station … was the armpit of detective duty—
Joseph Wambaugh
Joseph WambaughExamples of armpit in a Sentence
a city described as the armpit of America
Recent Examples on the Web
Try to find and avoid your sweating triggers, manage your stress levels, and apply a natural astringent or baking soda and cornstarch to your armpits.
—Sarah Hudgens, Health, 29 July 2025
Each receptor is a protein that can recognize and latch onto many kinds of odorants — molecules that are light enough to evaporate off your cup of coffee, the wet grass outside, or the microbes in your armpits, and waft into the air and, in turn, your nasal passages.
—Yasemin Saplakoglu, Quanta Magazine, 3 July 2025
The fatal shot entered Hinton's chest near his armpit on the left side hitting his heart, while another bullet grazed his right shoulder area.
—Cameron Knight, Cincinnati Enquirer, 19 May 2025
This includes looking and feeling for changes such as:
Lumps or thickening
Changes in size, shape, or feel
Skin texture changes (like puckering or dimpling)
Nipple discharge or changes
Persistent pain in the breast or armpit
The comment section of her video quickly filled with love and support.
—Lydia Patrick, MSNBC Newsweek, 6 May 2025
See All Example Sentences for armpit
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Sarah Hudgens, Health, 29 July 2025
Each receptor is a protein that can recognize and latch onto many kinds of odorants — molecules that are light enough to evaporate off your cup of coffee, the wet grass outside, or the microbes in your armpits, and waft into the air and, in turn, your nasal passages.
—Yasemin Saplakoglu, Quanta Magazine, 3 July 2025
The fatal shot entered Hinton's chest near his armpit on the left side hitting his heart, while another bullet grazed his right shoulder area.
—Cameron Knight, Cincinnati Enquirer, 19 May 2025
This includes looking and feeling for changes such as:
Lumps or thickening
Changes in size, shape, or feel
Skin texture changes (like puckering or dimpling)
Nipple discharge or changes
Persistent pain in the breast or armpit
The comment section of her video quickly filled with love and support.
—Lydia Patrick, MSNBC Newsweek, 6 May 2025
See All Example Sentences for armpit
Cite this Entry
“Armpit.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/armpit. Accessed 2 Aug. 2025.
Copy CitationKids Definition
armpit
noun
arm·pit
ˈärm-ˌpit 
: the hollow beneath the spot where the arm and shoulder join
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