His glasses fell down on the floor and broke up.
他的眼镜掉在地上摔碎了。
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动词词组break up,意思是“终止,结束或打碎、拆散”,英文的解释是,To scatter or disperse, to cease to exist as a unified whole(分散,破碎,不再是完整的)。
例句:
The crowd started to break up when the night fell.
天快黑时人群开始散开了。
Their marriage broke up. 他们的婚姻破裂了。