someone who is too willing to do whatever they are told to do, especially when the person, organization etc being obeyed is much more important or powerful (尤指对更有权势的人、组织等)卑躬屈膝者,唯命是从者
The ambassador is careful not to appear to be a US lackey. 这位大使很谨慎,不让自己看起来像是美国的走卒。