「後ろ」(ushiro) means "back" or "behind". It indicates a position at the rear of something, or subsequent in time. For example, if you're talking about someone standing behind a door, you would say, "ドアの後ろに" (doa no ushiro ni).

「後ろ」(うしろ)は「〜の背後」(はいご)という意味(いみ)です。物(もの)の位置(いち)を示(しめ)します。例(れい)：「ドアの後ろ」(うしろ)。