assuage (v.)

c. 1300, abreggen, "make shorter, shorten, condense," from Old French abregier, abrigier "abridge, diminish, shorten" (12c., Modern French abréger), from Late Latin abbreviare "make short," from Latin ad "to" (see ad-) + breviare "shorten," from brevis "short, low, little, shallow" (from PIE root *mregh-u- "short").

Abbreviate is the same word directly from Latin. The sound development that turned Latin -vi- to French -dg- is paralleled in assuage (from assuavidare) and deluge (from diluvium). Of writing, "shorten by omission," late 14c. Related: Abridged; abridging.

late 14c., "an overflowing of water, a great flood, Noah's Flood in Genesis," from Old French deluge (12c.), earlier deluve, from Latin diluvium "flood, inundation," from diluere "wash away," from dis- "away" (see dis-) + -luere, combining form of lavere "to wash" (from PIE root *leue- "to wash"). Figurative sense of "anything that overflows or floods" is from early 15c.

After me the deluge (F. après moi le déluge), a saying ascribed to Louis XV, who expressed thus his indifference to the results of his policy of selfish and reckless extravagance, and perhaps his apprehension of coming disaster. [Century Dictionary]