This entry distinguishes two verb forms which are homophonic in Byzantine and modern pronunciation. The primary headword is the aorist active infinitive of two verbs: pi/mprhmi (I burn up) and prh/qw (I blow, stream, burn); see generally LSJ s.vv., and cf. pi 1607, pi 2261, and pi 2262 (end). (This form could also be the aorist imperative middle, second person singular, of the same two verbs.) It is taken to be extracted from Homer, Iliad 2.415 (web address 1), its earliest attestation. There Agamemnon prays to Zeus that the sun not set before he is able to burn up the gates leading to Priam's halls.
[1] The headword is identically glossed in Photius' Lexicon (pi1160 Theodoridis), Lexica Segueriana 347.32, and the Synagoge; cf. Hesychius s.v. prh=sai. The D scholia to the aforementioned Homeric passage also provides this same gloss to the headword.
[2] The first verb -- given wrongly, here in the SOL, as the primary headword -- is the (unaugmented) aorist indicative active, third person singular, of the headword verbs. The second is the same form, but from the contract verb fusa/w; see generally LSJ s.v. This part of the entry follows the scholia to Homer, Iliad 1.481 (web address 2), where prh=sen (with nu-movable), is used of the wind blowing to swell a sail. Adler cites Lexicon Ambrosianum 1191 as identical; cf. ps.-Zonaras 1586.10, Hesychius s.v. prh=sen, Etymologicum Magnum 687.44-5 (Kallierges), Apollonius' Homeric Lexicon 134.28, and Apion, Fragmenta de glossis Homericis s.v. prh=sai.