Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sub-tendo, no perf., tum, 3, v. a. and n.
* sub-tĕnĕo, ēre, v. a., to hold underneath: vinaceos lectos cestibus subtento (contr. for subteneto), Cato, R. R. 25 Schneid. N. cr.