'break morale' is correct and usable in written English.
This phrase is usually used to refer to actions which cause a person, group, or organization to feel hopeless, discouraged, or unmotivated. For example, "The sudden downsizing of the company caused employees to lose confidence and break morale."
"The goal of attacks on them is to break morale and effectiveness".
More than six years into Syria's bitter civil war, Assad's military has repeatedly been accused of using chemical weapons in densely populated areas, a tactic that experts say is intended to sow terror and break morale.
The aim of the Zeppelins was clear - the Germans hoped to break morale at home and force the British government into abandoning the war in the trenches.
You didn't know if you were running towards danger or away from it". The aim of the Zeppelins was clear - the Germans hoped to break morale at home and force the British government into abandoning the war in the trenches.
It is a known way of breaking morale in all countries.
The situation in Hull has been somewhat obscured, from this point of view, by the occurrence of trekking, which was much publicized as a sign of breaking morale, but which in fact can be fairly regarded as a considered response to the situation.
He claimed to be a victim of psychological torture, but defiantly said, "They will not be able to break my morale".
It's true that bombing of civilians in World War II to break their morale elevated military terrorism to new technological heights.
But the Germans' primary motivation for producing these missiles wasn't reprisal but rather the hope (misguided, but similar to the logic behind much of the Allies' strategic bombing) that such weapons would break British morale and thereby force London to make a separate, compromise peace.
But what did "even more to break the morale of labour", as Volcker himself told us in our interview with him for The Making of Global Capitalism, was the Reagan administration's dismissal of 12,000 highly-paid air traffic controllers and the decertification of their union in 1981.
