媳妇熬成婆

1. • lit. even a submissive daughter-in-law will one day become a domineering mother-in-law (idiom)
2. • fig. the oppressed will become the oppressor
3. • what goes around comes around

Character by character

• 媳(xí)daughter-in-law
• 妇(fù)woman
• 熬(áo)cook on a slow fire
• 成(chéng)surname Cheng
• 婆(pó)grandmother