turn red, redden, become red
Latin word, found 29 times in the texts on Socratos.
Vergil, Georgics 2.34: ferre pirum et prunis lapidosa rubescere corna.
Vergil, Aeneid 3.521: Iamque rubescebat stellis Aurora fugatis,
Ovid, Metamorphoses 11.19: non exauditi rubuerunt sanguine vatis.
All forms of rubesco