toss a coin
flip a coin

We'll flip a coin in the morning to see which way we go.

How about flipping a coin for the space, she asked.

Why don't we just flip coins and be done with it.

To name the restaurant, the two men flipped a coin.

As always, he and John had flipped a coin to see who made the opening move.

I with two other officers and we flipped a coin to see who would pay for the movie.

In other words, even the experts would have been right almost as often if they had just flipped a coin.

It's better just to keep playing, or even to flip a coin.

But those decisions were not a matter of flipping a coin, she said.

"Why not simply flip a coin and be done with it?"