The phrase "abrupt course" is correct and usable in written English.
It can be used to describe a sudden or unexpected change in direction or behavior, often in a negative context.
Example: "The project took an abrupt course when the main investor pulled out at the last minute."
Alternatives: "sudden shift" or "unexpected turn".
Such miscues and abrupt changes of course have become a staple of Mr. Trump's dealings with Congress.
"It would probably be foolish to suggest that there would be abrupt change in course or direction," he said.
This was the Federal Reserve's most abrupt reversal of course since January 2001, when it suddenly slashed rates at an unscheduled emergency meeting because of signs that the economy was slipping into a recession.
In an hour-long interview that mixed a defence of his abrupt change of course over the bailout deal with barbs aimed at Greece's European partners, Tsipras said he had fought a battle not to cut wages and pensions.
Reds Hire General Manager The Cincinnati Reds chose Dan O'Brien as their general manager yesterday, an abrupt change of course from the past 11 years under his high-profile predecessor, Jim Bowden.
After an abrupt reversal of course that began with a fire sale in March 2004 and has continued into the N.H.L.'s new salary-cap era, there is only one perennial All-Star left on the Rangers: Jaromir Jagr.
In an abrupt change of course, Arizona lawmakers rejected new anti-immigration measures on Thursday, in what was widely seen as capitulation to pressure from business executives and an admission that the state's tough stance had resulted in a chilling of the normally robust tourism and convention industry.
Judge Jed S. Rakoff of Federal District Court in Manhattan delivered an abrupt change in course when he limited the claims that Irving S. Picard, the trustee appointed to oversee the investor claims, could pursue against Saul Katz and Fred Wilpon, the owners of the New York Mets, from their accounts with Mr. Madoff's firm.
Pentagon and state department officials were left scrambling to interpret an abrupt change in course from the US policy decided over the summer to keep forces in Syria to ensure the "enduring defeat of Isis" and to act as a bulwark against Iranian influence.
The move was the Fed's first rate reduction of any kind in four years, the steepest in nearly five years and its most abrupt reversal of course since January 2001, when policy makers sharply cut rates at an unscheduled emergency meeting just before the last recession.
