Lewis & Short

sub-lūco, āre, 1, v. a. [lux], to trim, cut away, thin out the branches of a tree, to admit light: sublucare arbores est ramos earum supputare, et veluti subtus lucem mittere, Fest. p. 348 Müll.: arbornisi a domino sublucari non potest, isque conveniendus est ut eam sublucet, Paul. Sent. 5, 6, 13; cf. colluco.