Frequency: The word is one of the 3000 most common words in English.
1.
If you do something on someone’s ~, you do it for that person as their representative. The form in someone’s ~ is also used, mainly in American English.
She made an emotional public appeal on her son’s ~...
Secret Service officer Robin Thompson spoke on ~ of his colleagues.
PHRASE: PHR after v
2.
If you feel, for example, embarrassed or angry on someone’s ~, you feel embarrassed or angry for them.
‘What do you mean?’ I asked, offended on Liddie’s ~.
PHRASE