The headword illustrates the literal sense of the verb porfu/rw (here in the present subjunctive), the supplementary quotation a figurative one; for both see LSJ s.v.
[1] Used literally of the sea, as at Homer, Iliad 14.16 (see web address 1). The gloss comes from a scholion on this verse; see also Apollonius the Sophist, Homeric Lexicon 133.32, and other lexica cited at Photius pi1109 Theodoridis.
[2] A hexameter verse of unknown origin: see LSJ s.v. I.2. (web address 2).