half-caf
▸ adjective denoting a drink of coffee with caffeinated and decaffeinated coffee mixed in equal parts, so as to make coffee with half the normal level of caffeine:
a half-caf latte.
▸ noun a drink of coffee made using caffeinated and decaffeinated coffee mixed in equal parts:
customers queued up for morning lattes, half-cafs, and mochas
[mass noun] he's down to about one cup of half-caf a day.