be a long shot

be a long shot

To be very risky, uncertain, or unlikely to succeed. (Of an attempt, proposition, or guess.) I know this is a long shot, but would you like to go out on a date with me sometime? The proposed tax law is a bit of a long shot from Democrats, as it is unlikely to be met with much support by the Republicans in Congress.
See also: long, shot
Farlex Dictionary of Idioms.
See also:
  • dangerously
  • take a gamble
  • a tiger by the tail
  • melt up
  • melt-up
  • dodgy deal
  • If you play with fire, you get burned
  • If you play with fire, you get burnt
  • put balls on
  • put balls on (something)