Set something to zero or reset it to nothing, or focused attention directly on something specific.
From Arabic 'ṣifr' (empty/zero), which entered English via Italian 'zero' in the 1600s. The concept of zero came from Islamic mathematics when Europeans encountered it and needed a word for 'nothing.'
The word 'zero' is actually Arabic—Europe didn't have a symbol for nothing until Muslim mathematicians introduced the concept! Before that, you couldn't write math easily, which is why Roman numerals never developed calculus.
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