頻(しき)るto do ... incessantly, to do ... hard, to happen repeatedly, to happen over and over again

Définition du dictionnaire

Suffixe, Verbe godan en 'ru'
1. 1.
  EN to do ... incessantly, to do ... hard
  Généralement écrit en kana uniquement, after the -masu stem of a verb,
  Voir aussi :
  降りしきる
Verbe godan en 'ru', Verbe intransitif
1. 2.
  EN to happen repeatedly, to happen over and over again
  Archaïque, orig. meaning