to order a dog, or sometimes a person, to stop attacking someone or something

I shouted to him to call his dog off, but he just laughed at me. 我大声喊他把狗叫开，可他只是嘲笑我。

Call off your thugs, and I'll show you where the money is. 叫你那帮暴徒走开，我会告诉你钱在哪里。

to decide that a planned event, especially a sports event, will not happen, or to end an activity because it is no longer useful or possible

Tomorrow's match has been called off because of the icy weather. 因为天气寒冷，明天的比赛取消了。

The police have called off the search for the missing child until dawn tomorrow. 警方暂停了对失踪孩子的寻找，明天天亮后再继续。