Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
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.