мышка

Etymology
From. The computing term is a.

Noun

 * 1)  mouse
 * 2)  armpit
 * 1)  armpit

Usage notes
The meaning 3 is used in modern Russian only in the fixed expressions под мышкой, под мышку, под мышки, под мышками, из-под мышек. See also the noun подмышка.