have (someone or something) by the tail

have (someone or something) by the tail

To be in complete control of someone or something; to be in a situation in which one's success is likely. Primarily heard in US. Any time my little brother wants to tattle on me, I just threaten to tell mom about the vase he broke—I've sure got him by the tail now! I can't wait to get my grades back—I studied so hard that I had my exams by the tail!
See also: by, have, tail
Farlex Dictionary of Idioms.
See also:
  • be replaced by (someone or something)
  • be replaced with (someone or something)
  • (one's) bearings
  • be remembered as (something)
  • be remembered as/for something
  • (one's) true colours
  • better (to be) safe than sorry
  • better safe than sorry
  • at (one's) doorstep
  • at doorstep