排队 (pái duì) is a verb-object phrase meaning 'to line up / queue up' — it is the standard way to say 'stand in a line' in everyday Chinese. Unlike the single verb 排 (pái), which can mean 'to arrange' or 'to line up' in a broader sense, 排队 specifically refers to people forming a queue. As a separable verb (离合词), the two characters can split: 排了一个小时的队 'queued for an hour'.