have a tiger by the tail

/HH AE1 V AH0 T AY0 G ER0 B AY0 DH AH0 T EY0 L/
verb
  1. 1

    To be in a difficult or dangerous situation in which one ideally should not remain, but from which one cannot withdraw.

Source: https://en.wiktionary.org/wiki/have%20a%20tiger%20by%20the%20tail