show the cloven hoof

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Related to cloven: cloven foot

show the cloven hoof

To reveal one's evil or malicious nature. The devil is typically depicted with cloven hooves. I thought I could trust Eric until he showed the cloven hoof by spreading rumors about me. Jill definitely sabotaged my last two relationships. She might seem nice, but she always shows the cloven hoof eventually.
See also: hoof, show