armpit

noun

arm·​pit ˈärm-ˌpit 

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

Examples of armpit in a Sentence

a city described as the armpit of America

Recent Examples on the Web

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

Other potentially concerning changes including nipple discharge, pain or swelling in their breast, changes in the color of the nipple or breast, the nipple turning inward, painful or enlarged lymph nodes in the armpits or near the collarbone, or redness or flaky skin on the breast. —Katia Hetter, CNN Money, 1 Oct. 2025

The third-year lineman’s rush included a right uppercut through Barton’s right armpit. —Brooks Kubena, New York Times, 1 Oct. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for armpit

• acquit
• admit
• amrit
• backlit
• befit
• cockpit
• commit
• dalit
• dendrite
• emit
• illite
• misfit

Kids Definition

armpit

noun

arm·​pit ˈärm-ˌpit 

: the hollow beneath the spot where the arm and shoulder join

Medical Definition

armpit

noun

arm·​pit ˈärm-ˌpit 

: the hollow beneath the junction of the arm and shoulder : axilla