a feather in (someone's) cap

old-fashioned

something very good that someone has done.

A new television series will be another feather in his cap.

• a breath of fresh air
• a bright spark
• a bright spot
• a broad church
• a Bronx cheer
• Absence makes the heart grow fonder.
• a bucks party
• a bully pulpit
• a bumpy ride
• a bum rap
• a bum steer
• a bundle of joy
• a busman's holiday
• a buzz word
• a call girl
• a calling card
• a camp follower
• a can of worms
• a carbon copy
• a carrot and stick
• a carrot and stick approach
• a carrot-top
• a case in point
• a cash cow
• a cat and mouse game