When I shall send upon them the evil arrows of famine, which shall be for their destruction, and which I will send to destroy you: and I will increase the famine upon you, and will break your staff of bread:
I shall send upon them ... arrows of famine - hail, rain, mice, locusts, mildew (see Deuteronomy 32:23-24).
I will 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, or accumulate, as the forces of an invading army, to bring famine on you.