Obs. rare. [OE. *fnǽstian, f. prec.; cf. OHG. fnâstôn]. intr. To breathe hard, pant; also quasi-trans. to breathe out (fire).
c. 1000. Sax. Leechdoms, II. 242. Fnæstiað swiðe.
c. 1300. Havelok, 548.
| Þat he [ne] mouthe speke, ne fnaste, | |
| Hwere he wolde him bere or lede. |
c. 1340. Sir Gawayne and the Green Knight, 1702. His felaȝes fallen hym to, þat fnasted ful þike.
c. 1400. Destr. Troy, 877.
| Of þe orible oxin, vgsome to see, | |
| þat fyre out fnast with a fuerse lowe. |
Hence Fnasting vbl. sb., breathing, snorting.
1382. Wyclif, Jer. viii. 16. Fro Dan is herd the fnesting of his hors.
c. 1400. Destr. Troy, 167.
| These balfull bestes were, as þe boke tellus, | |
| ffull flaumond of fyre with fuastyng of logh. |