calleō —, —, ēre
callum, to be callous; hence, fig., to be experienced, be skilful, be versed: in ea, quorum usu calleret, L. — To know by experience, be skilled in, have the knowledge of, understand: illius sensum, T.: iura: urbanas rusticasque res pariter, L.: sonum digitis et aure, H.: Duram pauperiem pati, to know how, H.: deprendere, Iu.: quo pacto id fieri soleat calleo, T.