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To anchor or fasten something or someone in place.
系紧或扣紧，一般指安全带
A sign just ahead of me said, Buckle Up. It's the Law.
我面前的一个牌子上写着：扣好安全带。这是法律规定。
Kids, let's all buckle up and hit the road!
孩子们，让我们把安全带都系好，准备上路了!
According to the new law, all drivers and passengers must buckle up. 根据新法规，所有的驾驶员和乘客都必须系上安全带。