Lewis Short
lŭtesco, ĕre
* V. inch. n. [2. lutum], to turn to mud, become muddy: litora, quae limo caenoque lutescunt,Col. 8, 17, 9: cava terra lutescit, Furius Antias ap. Gell. 18, 11; id. ap. Non. 133, 26.
Charlton T. Lewis, Charles Short, A Latin Dictionary