show the cloven foot

Satan is depicted as having cloven feet.

show the cloven foot (third-person singular simple present shows the cloven foot, present participle showing the cloven foot, simple past showed the cloven foot, past participle shown the cloven foot)

1. (intransitive) To reveal a devilish character or an evil purpose, despite attempts to disguise it.
   • 1852, “The Marriage of Johnny Beedle”, in Traits of American humour, by native authors, ed. and adapted by the author of 'Sam Slick'., page 77:

     Well, I went over to the Squire's, pretty well satisfied in my own mind; so, after flattering and crowing about her a little while, I up and shew the cloven foot.

• show the cloven hoof