from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A violent uproar; a tumult.
- n. A reversal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Complete overthrow; reversal; turmoil
from the GNU version of the Collaborative International Dictionary of English
- n. Complete overthrow; disorder; a turning upside down.
from The Century Dictionary and Cyclopedia
- n. A turning upside down; the act of overturning; the state of being overturned; overthrow; overturn; subversion; hence, generally, convulsion or confusion.
French, from Old French bouleverser, to overturn : boule, ball (from Latin bulla) + verser, to overturn (from Old French, from Latin versāre, frequentative of vertere, to turn; see wer-2 in Indo-European roots).(American Heritage® Dictionary of the English Language, Fourth Edition)