n.1

Can we slow down and walk for a bit? I'm getting a stitch. 咱们放慢速度步行一会儿好吗? 我觉得腰部突然一阵剧痛。

The boy's good distance away, I do not have to slow down. 那男孩离得很远，我不必减慢车速。

I told him several times to slow down, but he pay no attention. 我告诉他好几遍让他减速，可他就是不听。

To slow down or impede by creating an obstruction. 阻塞用制造障碍的方式使慢下来或使受阻

Before turning, you should slow down your car. 转弯前，你得先减速。