noun
cufflinks
Decorative fasteners used to secure the cuffs of a dress shirt.
from English cuffs · from Portuguese botão
彼はスーツに合わせて銀のカフスボタンを着けていた。
He wore silver cufflinks with his suit.
Loanword from English 'cuffs' and Portuguese 'botão' (button), reflecting historical trade contact.