sur-rŭbĕo (subr-), ēre, v. n.,
to be somewhat red or reddish , to blush : quale coloratum Tithoni conjuge caelum Subrubet, aut sponso visa puella novo, Ov. Am. 2, 5, 36: uva purpureo mero, id. A. A. 2, 316: grossi, Pall. Mart. 10, 31.
sub-rubeō (surr-) —, ēre, to grow ruddy, turn reddish, blush: Quale caelum subrubet, O. ...
An Elementary Latin Dictionary