螺丝钉 (螺絲釘) luósīdīng

luósīdīng noun a screw
Domain: Modern Chinese 现代汉语
Notes: (CC-CEDICT '螺絲釘'; Guoyu '螺絲釘'; Wikipedia '螺絲')

Contained in

• 永不生锈的螺丝钉(永不生銹的螺絲釘) a screw that never rusts — sb who selflessly and wholeheartedly serves the Communist Party, like Lei Feng 雷锋, to whom the metaphor is attributed