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3. a feather in cap

a feather in cap

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a feather in your cap

an achievement that you can be proud of An order for 28 new aircraft is quite a feather in Boeing's cap.

See also: cap, feather

a feather in somebody's cap

  (old-fashioned)

something very good that someone has done A new television series will be another feather in his cap.

See also: cap, feather