VERB
叩头;磕头；卑躬屈膝；唯命是从
If you say that someone kowtows to someone else, you are criticizing them because they are too eager to obey or be polite to someone in authority.
例句
See how stupidly they kow-tow to persons higher in the hierarchy.
瞧他们对上级唯命是从的样子是多么愚蠢啊。