Used in negative statement to describe a situation that has existed up to this point or up to the present time(adverb)
WordNet. Princeton University. 2010.
Use "until now" in a sentence
"However, Prussia's terrible humiliation, notwithstanding all its mournful results, first opened the way for the exercise of those energies of the country that had been until now suppressed."
"It was as if I were a spring-wound toy, twisted for years and years until now finally I had to let go or break."
"For those moviegoers who spot such ear-stingers, and whose recourse until now was only to mutter, with Hamlet, “The time is out of joint”: “O cursed spite, / That ever I was born to set it right.”"