honor

do the honors

to perform social duties at an event. Jerry, I need to go into the kitchen for a moment, so why don't you do the honors and get Carol a drink?

Usage notes: usually said about serving food and drinks or greeting and introducing guests

on your honor

1. with a serious promise. She swore on her honor that she'd finish the assignment.

2. without being watched to see if you behave in the right way. We ask people, on their honor, to avoid leaving garbage at the campsite.