down (one's) nose
In a haughty or snobbish manner (typically because one regards oneself as superior to others). The well-dressed businessman looked down his nose at the homeless man sitting on the corner. Once Jane was promoted to management, she looked down her nose at the people who used to be her colleagues.
down (one's) nose
Informal With disapproval, contempt, or arrogance: Year-round residents here look down their noses at the summer people.