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
Keep an eye out for bloody or watery nipple discharge and armpit lumps.
—Melissa Fleur Afshar, MSNBC Newsweek, 30 Oct. 2025
Separate your knees toward your armpits, keep your tailbone on the ground.
—Cory Martin, Verywell Health, 30 Oct. 2025
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
See All Example Sentences for armpit
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Melissa Fleur Afshar, MSNBC Newsweek, 30 Oct. 2025
Separate your knees toward your armpits, keep your tailbone on the ground.
—Cory Martin, Verywell Health, 30 Oct. 2025
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
See All Example Sentences for armpit
Cite this Entry
“Armpit.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/armpit. Accessed 8 Nov. 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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