The phrase "abruptly falling" is correct and usable in written English.
It can be used to describe something that is dropping or decreasing suddenly and unexpectedly.
Example: "The stock prices were abruptly falling after the announcement of the company's poor earnings report."
Alternatives: "suddenly dropping" or "sharply declining".
Among them he found videos of soldiers pointing guns directly toward people taking photographs, and of cameras abruptly falling to the ground.
Within weeks it was obvious that, in the opening months of this year, several of Philips's main markets had slowed down abruptly; falling demand for semiconductors and telecoms equipment clobbered the bottom line.
That same day, as fate would have it, Kabul was abruptly falling to the Northern Alliance, who promptly dismayed Washington by disobeying orders and following John Simpson into town.
Until about 12 30 a.m., when the heater in our condo started emitting a horrible high-pitched whine, a keening sound that rose in pitch, as though ascending a mountain of sound before abruptly falling off a cliff.
The undertones of sadness in this goofy piece — in lines of silhouetted soldiers and abruptly falling bodies, all but unacknowledged in the cheerful fray — seemed much more pronounced (and painful) on Friday.
Analytics firm comScore has just released its latest statistics for video streaming sites in the United States for the month of June, and at first glance the results are quite surprising: the top video sites have seen a major shakeup, with many of the top sites abruptly falling in the rankings.
The lights abruptly fell in the athletic center.
The pavement abruptly fell off and the street became rocky.
But less than nine months after his treatment ended, McGhee abruptly fell apart.
Then Corsi abruptly fell silent, canceling a scheduled Nov. 13 interview with NBC.
Austria's old ruling coalition, reunited Wednesday after three months of wrangling, abruptly fell apart today.
