The rumbling was mingled with a subterranean roar, which formed a sort of rinforzando, and died slowly away, as if some violent storm had passed through the profundities of the globe.    From Wordnik.com.  [The Mysterious Island] Reference

Send me tidings of yourself from Vienna (if not sooner), and, whatever rinforzando of "murrendo" may happen, please don't do a wrong to the sentiments of sincere esteem and cordial friendship invariably maintained towards you by.    From Wordnik.com.  [Letters]