a snake in (one's) bosom

a snake in (one's) bosom

Someone whom one has befriended, taken care of, or treated well but proves to be traitorous, untrustworthy, deceitful, or ungrateful. (Used especially in the phrase "nourish/nurse/nurture a snake in one's bosom.") Well, it turns out that Margaret was quite a snake in my bosom. I put my neck on the line to get her a job in our company, and then she turns around and tries to get me fired! I thought our love was not only mutual but indestructible; and yet, I have nursed a snake in my bosom all these years: my darling husband has cast me out and run off with a younger woman.
See also: bosom, snake
Farlex Dictionary of Idioms.
See also:
  • a serpent in (one's) bosom
  • serpent
  • nourish a snake in (one's) bosom
  • nourish a viper in (one's) bosom
  • nurse a serpent in (one's) bosom
  • nurse a snake in (one's) bosom
  • nurse a viper in (one's) bosom
  • nurture a serpent in (one's) bosom
  • nurture a snake in (one's) bosom
  • nurture a viper in (one's) bosom