"Knock chip off one shoulder" is an idiom that means to overcome arrogance or a defensive attitude, or to prove oneself superior to someone who doubted or insulted you previously. There are several synonyms for this phrase, including "let bygones be bygones," meaning to forgive and move on from past grudges or insults. Another synonym is "rise above," which means to ignore or rise beyond petty insults or conflicts. "Take the higher road" is another synonym, and it means to rise above pettiness and petty disagreements and take a more mature or rational approach. Finally, "walk away the bigger person" is another synonym, meaning to leave a conflict or conversation without stooping to someone else's level.