set out one's stall

/S EH1 T AW0 T W AH0 N EH0 S T AO0 L/
verb
  1. 1

    To make publicly clear one's position with reference to a particular idea or philosophy.

    โ€œJohn has obviously set out his stall for the Green Party.โ€

Source: https://en.wiktionary.org/wiki/set%20out%20one's%20stall