sub-tendo

I. perf., tum, 3, v. a. and n.
I. Act., to stretch underneath: lectos loris, Cato, R. R. 10, 5; 10, 25.—*
II. Neutr., to extend underneath: linea, Front. Expos. Form. p. 32 Goes.
Lewis & Short
A Latin Dictionary, 1879
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