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
Intertrigo typically occurs in areas with skin folds, such as the armpit region.
—Sherri Gordon, Health, 17 Oct. 2025
Riders crammed armpit to nostril on train platforms.
—Eric Lach, New Yorker, 9 Oct. 2025
At the time, Morales-Reyes testified that Scott had cut him under his armpit with a corkscrew while attempting to rob him of his bicycle.
—Eva Wen, jsonline.com, 3 Oct. 2025
The content creator said her doctor ordered a mammogram and ultrasound of the lymph node in her armpit.
—Vanessa Etienne, PEOPLE, 3 Oct. 2025
See All Example Sentences for armpit
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Sherri Gordon, Health, 17 Oct. 2025
Riders crammed armpit to nostril on train platforms.
—Eric Lach, New Yorker, 9 Oct. 2025
At the time, Morales-Reyes testified that Scott had cut him under his armpit with a corkscrew while attempting to rob him of his bicycle.
—Eva Wen, jsonline.com, 3 Oct. 2025
The content creator said her doctor ordered a mammogram and ultrasound of the lymph node in her armpit.
—Vanessa Etienne, PEOPLE, 3 Oct. 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 30 Oct. 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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