mansuefio
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
Latin > English
mansuefio mansuefieri, mansuefactus sum V SEMIDEP :: become/be tamed/civilized/peaceful
Latin > English (Lewis & Short)
mansŭēfīo:
I pass., from mansuefacio.
Latin > French (Gaffiot 2016)
mānsuēfīō,¹⁵ factus sum, fĭĕrī, pass. de mansuefacio , s’apprivoiser : Cæs. G. 6, 28, 4 ; mansuefactus Plin. 8, 65, etc., apprivoisé || [fig.] s’adoucir [en parl. du caractère] ; mansuefactus Cic. Tusc. 1, 62, adouci.