sum-mūto (subm-), āre, v. a.,
to change , interchange , substitute one thing for another: hanc ὑπαλλαγὴν rhetores, quia quasi summutantur verba pro verbis, μετωνυμίαν grammatici vocant, quod nomina transferuntur, Cic. Or. 27, 93.
summuto (submūto) —, —, āre, to interchange substitute: summutantur verba pro verbis. ...
An Elementary Latin Dictionary