Diamond cuts diamond

Meaning: This proverb means that one sharp or clever person can only be matched or defeated by another equally sharp or clever person. It teaches that strength, skill, or cunning is best met with equal strength, skill, or cunning.

Origin: This saying comes from old English usage and has parallels in many cultures. It reflects the idea that only something equally strong or clever can counter another.

Examples:
- A clever trickster was finally caught by someone just as smart — diamond cuts diamond. In business, only a sharp negotiator can match another sharp negotiator — diamond cuts diamond.

Vietnamese: Vỏ quít dày có móng tay nhọn

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