draw straws for
draw straws for (something)
To decide something by picking at random from straws of different lengths. The person who pulls the shortest straw is usually the winner (or loser if they have "won" something unpleasant). Let's draw straws to decide who will go first—it's the only fair way to do it.
draw straws for something
Fig. to decide who gets something or must do something by choosing straws from an unseen set of straws of different lengths. (The person who gets the shortest straw is chosen. See also draw lots.) We drew straws for the privilege of going first. Let's draw straws for it.