Wiktionary
latte macchiato
n. A coffee-based beverage, prepared by "staining" the steamed "pure" white milk by the addition of espresso, using ½ or less of the espresso shot of caffè macchiato.
Wikipedia
Latte macchiato
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Latte macchiato is a coffee beverage; the name literally means stained milk. This refers to the method of preparation, wherein the milk is "stained" by the addition of espresso.