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Definition of Knock box
1. Noun. A small container usually provided with a bar used to empty espresso grounds by pounding a portafilter against the sides or the bar. ¹
¹ Source: wiktionary.com
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1. Noun. A small container usually provided with a bar used to empty espresso grounds by pounding a portafilter against the sides or the bar. ¹
¹ Source: wiktionary.com