Lewis & Short

sub-tĕgo, xi, ĕre, v. a., to cover underneath: caelum, Amm. 19, 7, 3 (al. sub-texunt); Vitr. 9, 9: aëra ipsum subtexisse jaculis, Jul. Val. Rer. Gest. Alex. 2, 4: sub avis caudā pedes equi sunt subtecti, Vitr. 9, 9: subtecto nubibus caelo, Hilar. in Psa. 146, 7; Aug. Quaest. in Heptat. 2, 177, 14.