pick up speed
pick up steam
gather speed

And they will continue to pick up steam until the evidence is accepted as proof.

But wait: What if these two proposals pick up popular steam?

"Our own polls show us down only about ten points and picking up steam," he said.

More recently, there has been another return to the traditional, and this is where the show really picks up steam.

"If the rally is not over, it will need fresh news to pick up steam again," he said.

But there is evidence the idea may be picking up steam.

The efforts are expected to pick up steam on Wednesday.

If the fun never ends, neither does it ever pick up steam.

Two months ago, people worried that the economy wasn't picking up enough steam.

The crowd was buzzing again, beginning to pick up steam.