"Fawns upon" is a phrase that refers to someone who is overly flattering or submissive towards another person, often in hopes of gaining their favor or approval. Some synonyms for this phrase might include "grovelling," "kowtowing," "sycophantic," or "obsequious." Each of these words suggests someone who is behaving in a way that is insincere or overly deferential, with the goal of manipulating or pleasing another person. While it's important to be polite and respectful towards others, it's equally important to maintain a sense of authenticity and honesty in our interactions. Using these synonyms can help us to better understand the negative implications of "fawning upon" someone, and to avoid engaging in such behavior in our own lives.