Kowtowing is an act of servile deference or submission, often done by bowing deeply and touching the forehead to the ground. It is a gesture of respect and humility, usually done in order to gain favor from someone in a higher position. In this context, it can be seen as a form of flattery, which is an attempt to gain favor by complimenting or praising someone. Therefore, the term 'try to gain favour by flattery' can be summarized as kowtowing.