yì
spy on
Simplified form of 睪. Depicts shooting an arrow (矢) into the eye (目).
Components
又 Simplified component
yòu
(hand), again
Shorthand for the 目 component in the traditional character 睪.
Evolution

Bronze script
Early Warring States (~400 BC)
Seal script
Shuowen (~100 AD)Traditional script
ModernSimplified script
Modern