Hypertext Webster Gateway: "armhole"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Armhole \Arm"hole`\, n. [Arm + hole.]
1. The cavity under the shoulder; the armpit. --Bacon.
2. A hole for the arm in a garment.
From WordNet (r) 1.7 (wn)
armhole
n : a hole through which you put your arm and where a sleeve can
be attached
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