形けい影えい

noun

form and shadow; inseparable things

A classical literary expression for two things that are as inseparable as an object and its shadow. Not used in everyday speech; appears in old texts or poetic language.

• 形けい影えい相あい伴ともなうという言こと葉ばがある。

  There is a phrase 'form and shadow go together,' meaning two things are inseparable.