(of war ) make or become more serious by stages
make or become higher,greater,etc.
"The Allies escalated the bombing"
The white liberal must escalate his support for the struggle for racial justice.
出自： M. L. King
A dispute arose, initially involving one man,..and then escalated until some 14,000 employees..went out on indefinite strike.
出自： M. Edwardes
It all escalated from car stealing up to armed robbery.
出自： N. Mailer