have one foot on a banana peel

/HH AE1 V W AH0 N F UH0 T AA0 N AH0 B AH0 N AE0 N AH0 P IY0 L/
verb
  1. 1

    (informal, idiomatic) To be in an unstable situation with a high risk of sudden negative change, facing difficulty, or appearing foolish.