Lewis Short
flaccesco (ante-class. also flaccisco), flaccŭi, 3
* V. inch. n., to wilt, wither, dry up (cf. tabesco).
* Lit.: faeniculum cum legeris, sub tecto exponito, dum flaccescat,Col. 12, 7, 4: flaccescente fronde,Vitr. 2, 9, 2: stercus cum flaccuit,Varr. R. R. 1, 13, 4.
* Trop., to become faint or feeble, to droop, languish: flucti flacciscunt, silescunt venti, Pac. ap. Non. 488, 15 (Trag. Rel. v. 77 ed. Rib.): flaccescebat oratio, * Cic. Brut. 24, 93: flaccescentes voluptates,Arn. 4, 142: ad numerum cymbalorum mollita indignatione flaccescunt,i. e. become mild, softened,id. 7, 237.
Charlton T. Lewis, Charles Short, A Latin Dictionary