腋窝 (yèwō): armpit

Measure Word

一个腋窝 gè

Xiàtiān yèwō róngyì chūhàn.

Armpits sweat easily in summer.

Tā bǎ shū jiā zài yèwō xiàmiàn.

He tucked the book under his armpit.

memory

腋 (armpit, with the flesh radical 月) + 窝 (nest/hollow) — the hollow nest under your arm.

腋 yè

窝 wō