work loose meaning in English

变松
松掉

The screw worked loose and the door fell off the cupboard
螺钉松脱了，门从碗橱上掉了下来。
After careful examination , we found that the screw had worked loose
经仔细检查后，我们发现螺钉松了。
The board had been working loose for several months , and in the end it slid to one side , showing a hole underneath
那块板松动有几个月了，最后滑到了一边，下面露出了一个洞。
He only saw the factory lad suddenly fall back on the cords , saw blood oozing in two places , and saw the cords themselves work loose from the weight of the hanging body , and the factory lad sit down , his head falling unnaturally , and one leg bent under him
他只看到，不知为什么工场伙计突然倒在绳索上，血从两个地方喷射出来，绳索本身在下垂的身体的重压下松开了，而工场伙计不自然地垂着头，屈着一条腿坐了下去。