With the bread of tears; either with tears instead of bread, which they either want, or cannot eat because their grief hath taken away their appetites; or with tears as frequent and constant as their eating it. See the like phrase Psalms 42:3.
Related Commentaries of Psalms 80:5
Psalms 80:5
5 Thou feedest them with the bread of tears; and givest them tears to drink in great measure.