per-frĕmo, ui, 1, v. n.,
to roar or snort along (ante-class.): perfremunt delphini, Att. ap. Cic. N. D. 2, 35, 89.
per-fremō —, —, ere, to roar about, snort along: perfremunt delphini, Att. ap. C. ...
An Elementary Latin Dictionary