past master
US /pæst ˈmæs.tər/
UK /pæst ˈmæs.tər/
1.
老手, 行家, 专家
a person who is very skilled or experienced in a particular activity or subject
:
•
He's a past master at negotiation, always getting the best deal.
他是谈判的老手，总能谈成最好的交易。
•
She's a past master at making excuses.
她是找借口的老手。