(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