They break in pieces thy people - They tread down; they grind; they crush. The Hebrew word is often used as meaning to crush under foot; to trample on; and hence, it means to oppress. Lamentations 3:34; Isaiah 3:15.
And afflict - To wit, by oppression and wrong. If this refers to foreigners, it means that they did this by invasion and by the ravages of war.
Thine heritage - Thy people, regarded as an inheritance or possession. See Psalms 28:9, note; Psalms 33:12, note; Psalms 68:9, note; Psalms 74:2, note; Isaiah 19:25, note; Isaiah 47:6, note; 1 Peter 5:3, note.