arrows of famine - hail, rain, mice, locusts, mildew (see Deu 32:23, Deu 32:24).
increase the famine - literally, “congregate” or “collect.” When ye think your harvest safe because ye have escaped drought, mildew, etc., I will find other means [Calvin], which I will congregate as the forces of an invading army, to bring famine on you.