D defs.my
Entry 2 senses Webster, 1913

Armhole

· Arm·hole · IPA /ˈɑɹmˌhoʊl/
01 n. The cavity under the shoulder; the armpit.
  1. 1.
    The cavity under the shoulder; the armpit.
  2. 2.
    A hole for the arm in a garment.