To make one's yoke heavy/ to lay a heavy burden upon

To oppress him. To place upon him a heavier burden (a load, literally, the yoke of oxen).

("And the children that were brought up with him spake unto him, saying, Thus shalt thou say unto this people that spake unto thee, saying, Thy father made our yoke heavy, and thou hast made it lighter than ours; thus shalt thou speak unto them, I am the youngest, and I will be fatter than my father's loins" - 1 Kings 12:10, and so: "Those that come after you shall weaken the people/ shall make their yoke heavier to pursue them" - Saul Chernykhovsky/ From the Visions of the False Prophet)

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