Crossword Clue:

to increase as in intensity

AnswerCrossword Clue
DRUMUPWork to increase, as business
STEPUPIncrease in intensity
ESCALATEIncrease in intensity
ESCALATEIncrease in intensity.
RAMPIncrease in intensity, with "up"
BATEReduce in intensity, as breath
DEEPENSIncreases in intensity, as a storm