a polite formulaic expression used to decline an invitation, connection, or favor by suggesting one is not deserving

承蒙您这么看得起我，但我资历尚浅，实在不敢高攀。

to humbly suggest that one's social status is too low to associate with someone of higher rank or wealth

对方家世显赫，像我们这种普通人家哪敢高攀？