かげ

shade, shadow, behind someone’s back

→ 陰
noun Rare #43,778
shade, shadow Can also mean “behind someone’s back” in expressions such as 陰で言う.
JA: 木のかげで休みましょう。
EN: Let’s rest in the shade of the tree.
behind someone’s back Used when someone does or says something secretly, out of another person’s presence.
JA: かげで人の悪口を言わないで。
EN: Don’t say bad things about people behind their backs.

他人のかげで悪口を言ってはなりません。

You must not speak ill of others behind their backs.

月が雲のかげから現れた。

The moon emerged from behind the clouds.