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

Symptoms can include a lump in the armpit, dimpled skin on the chest, red or flaky skin near the nipple, pain or tenderness on the chest or armpit, clear or bloody nipple discharge and an inverted nipple, per the Cleveland Clinic. — Toria Sheffield, PEOPLE, 18 July 2026

The body’s nervous response to that threat — the racing heart, sweaty armpits, and hair follicles on end — offered a lesson. — Rachel Nuwer, Quanta Magazine, 17 July 2026

Be sure to check in and around your hair, ears, belly button, groin area, behind the knees and armpits. — Amanda Roome, The Conversation, 16 July 2026

Apply cool, damp towels on your dog’s neck, armpits and groin. — Cody Godwin, USA Today, 16 July 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for armpit

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

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