"redoubling" in the verb sense
double in magnitude, extent, or intensity
"The enemy redoubled their screaming on the radio"
"The noise doubled and redoubled"
make twice as great or intense
"The screaming redoubled"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License