show (one's) horns

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

See also: horn, show

See also:

cloven
cloven hoof
a cloven hoof
wear the horns
all horns and rattles
rattle
put horns on (one)
draw in your horns
draw/pull in one's horns, to
draw/pull in your horns

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