「待つ」(matsu) means to wait for someone or something. It is a transitive verb. You use the particle "を" to indicate what or who you are waiting for. This verb is fundamental for daily conversations. For example: 友達を待つ。(Tomodachi o matsu.) = To wait for a friend.

時(じ)間(かん)や人(ひと)が来(く)るまで動(うご)かずにいることです。「〜を待(ま)つ」の形(かたち)で使(つか)います。例(れい)：バスを待(ま)つ。