long shot

/L AO1 NG SH AA1 T/
noun
  1. 1

    Something unlikely; something that has little chance of happening or working.

    โ€œWe can try your plan, but it's a long shot and it probably won't work.โ€

  2. 2

    A master shot, the primary wide shot of a scene into which the closeups will be edited later.

Source: https://en.wiktionary.org/wiki/long%20shot