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

Although the condition does not have an official definition, many researchers describe it as frequent pain in the chest, shoulder, arm or armpit lasting at least three months after surgery. —Brett Kelman, USA Today, 4 Apr. 2026

To get on a bus is to spend some time climbing aboard, or being pushed from behind, or being pulled up by the armpit. —Literary Hub, 3 Apr. 2026

The very bright star Rigel marks his left knee, and Betelgeuse, a bright and noticeably orange star, resides at the Hunter’s right armpit. —Mike Lynch, Twin Cities, 29 Mar. 2026

Another bullet entered at the back of the left arm and exited from the left armpit. —Chris Ramirez, jsonline.com, 27 Mar. 2026

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