「先週」 means last week, referring to the week immediately before the current one. This term is used to talk about events or activities that happened in the previous week. Useful for recounting past experiences.

今(いま)の週(しゅう)の１(ひと)つ前(まえ)の週(しゅう)を意味(いみ)します。先週(せんしゅう)あった出来事(できごと)や活動(かつどう)を話(はな)すときに使(つか)います。