隠れる

Verb

 * 1) hide; conceal oneself
 * 2) become invisible; become latent
 * 3)  to die

Usage notes
In Japan, the euphemism referred to the demise of an emperor. It was based on the belief that the emperor of Japan was a descendant of the solar goddess Amaterasu, so this usage meant "the sun [the emperor] was hidden in the clouds".