in Latin grammar, part of the conjugation of a verb, being a verbal substantive of the singular number and the fourth declension.

There are two kinds of supines: One, called the first supine, ending in um of the accumulative case, which is always of an active signification, and follows a verb of motion; as ambulatum. The other, called the last supine, and ending in u of the ablative case, is of a passive signification, and is governed by substantives or adjectives; as, facile dixit, &c.

They have their name, says Probus, and after him Vossius, quod ad inflar supinorum et otiorum hominum omnia habent confusa: or, according to Priscian, quod narrantur a participiis paffirit, que supina appellata fuit, quia in infimo loco stat totam coniugationis molem jucundum.