The phrase "new supervisor" refers to someone who has recently been given the role of overseeing and managing a group of people at work. Full definition
As instructors encourage new supervisors to share their transition challenges and frustrations with their peers, they simultaneously teach that it's OK to be vulnerable and honest. (inc.com)
Six towns will have new supervisors next year, an unusually high turnover. (hudsonvalleyone.com)
A potential new supervisor wouldn't be completely happy with you using his or her lab conducting research that may be very different to his / hers. (nextscientist.com)