blur
verb (used with object)
to obscure or sully (something) by smearing or with a smeary substance.
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.
His vision had been blurring badly during the day, and now his eyeballs ached as though they had been seared.
From The Leopard Woman by Stewart Edward White