zero
noun
the figure or symbol 0, which in the Arabic notation for numbers stands for the absence of quantity; cipher.
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The blogger had been zeroing in on the sheriff’s finances, specifically $150,000 that by law should have gone toward feeding inmates in the county jail.
From New York Times ● Dec. 14, 2017