[2] í byljakasti ‘in the tossing of winds, sudden squall’: In MIcel., kast can have the meaning ‘a sudden, violent, but short-lasting development in the weather’, as in kuldakast or frostakast (‘cold snap’, Sigfús Blöndal 1920-4: kast I.2). A bylr is a gust of wind or squall (ONP: bylr). This is the only occurrence of the cpd in ON, but cf. the entry byljaköst in Sigfús Blöndal 1920-4.