"I will make your yoke heavier." A yoke is a metaphor for labor. Alternate translation: "I will force you to work harder" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Possible meanings are that 1) "scorpions" is a metaphor for any kind of painful punishment. Alternate translation: "I will punish you much more harshly" or 2) "scorpions" is a metaphor for whips with sharp metal barbs at the end. Alternate translation: "I will punish you with whips that have sharp pieces of metal at the ends" (See: [[rc://en/ta/man/translate/figs-metaphor]])