At intervals

prep_phrase

Definitions

Prep_phrase
  1. 1
    now and again; intermittently

    "His face was beautiful to look upon, and softly coloured like a girl’s face, and his expression one of gentle melancholy, mixed with some disdain; but fiery glints awoke at intervals in his eyes, and the lines of swift determination hovered round the mouth below his curled moustachios."

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