right armpit; right side
Refers to the area under the right arm or the right side of the body. Often used in contexts like carrying something under the arm or describing a location relative to the body.
He was holding documents under his right arm.
There is a small mole on my right side.
Compound of 右 (みぎ, 'right') and 脇 (わき, 'armpit; side'). The reading is a straightforward combination of the two components.