Lewis Short
dē-tŭmesco, mŭi, 3
* V. inch. n., to cease swelling, to settle down, subside (postAug. and very rare): stagna lacusque sonori detumuere,Stat. Th. 3, 259: animi maris,id. ib. 5, 468.—Trop.: odia,Petr. 109, 5: colla superbarum gentium,Amm. 15, 8, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary