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a leopard can't/doesn't change its spots
a leopard can't/doesn't change its spots [idiom]
something you say that means a person's character, especially if it is bad, will not change, even if they pretend it does
ز ناپاکزاده مدارید امید که زنگی به شستن نگردد سپید
مثال:
She promised me that she would never tell any other lies and I trusted her, which was a complete fiasco. After all, a leopard cannot change its spots.