The staff of bread - Bread is so called because it is that on which the support of life mainly depends.
With astonishment - With dismay and anxiety at the calamities which are befalling them.
Related Commentaries of Ezekiel 4:16
Ezekiel 4:16
16 Moreover he said unto me, Son of man, behold, I will break the staff of bread in Jerusalem: and they shall eat bread by weight, and with care; and they shall drink water by measure, and with astonishment: