be on a loser

be on a loser

To part of a failing effort. I really think she's on a loser with this project—there's no way it'll get funded.
See also: loser, on
Farlex Dictionary of Idioms.

be on (or on to) a loser

be involved in a course of action that is bound to fail.
See also: loser, on
Farlex Partner Idioms Dictionary
See also:
  • two-time loser
  • dode
  • read it and weep
  • chicken
  • race for pinks
  • read 'em and weep
  • double-dome
  • retread
  • loser
  • a sore loser