At somebody's discretion phrase
The freedom to decide to do something at your own will
You want to deal with this matter is at your discretion.
The boss gave Tom the permission to do the job at his own discretion.
1. Doing something extremely well
2. Behaving in an extreme or remarkable manner
1. Holly was in rare form during her speech, so she got the first prize in the competition last night.
2. Corrine: I'm going to buy Christmas presents for everybody. Do you want to go with me?
Laura: Oh...My kids are in rare form today, so I cannot go with you. Sorry!