Definition of a feather in someone's cap
- The promotion was a feather in his cap.
: any of the light, horny, epidermal outgrowths that form the external covering of the body of birds
: the vane of an arrow
: to furnish (something, such as an arrow) with a feather
: to cover, clothe, or adorn with or as if with feathers
: to turn (an oar blade) almost horizontal when lifting from the water at the end of a stroke to reduce air resistance
: some person : somebody
: a head covering especially with a visor and no brim
: a distinctive head covering emblematic of a position or office: such as
: a cardinal's biretta
: to provide or protect with a cap
: to give a cap to as a symbol of honor, rank, or achievement
: to form a cap over : crown
: a small amount of an illegal or legally regulated drug
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