DENVER — As the Broncos struggled to move the ball for the better part of three quarters, fans made their displeasure known.

With every errant pass, failed run or stalled drive, the crowd at Broncos Stadium at Mile High hurled down boos at Denver's offense.

Quarterback Case Keenum, who led a unit that scored three points on its first seven drives, acknowledged after the Broncos' 23-20 loss that he could hear the vocalized dismay.

It's not the first time Keenum's heard boos in his career, he said. And in this situation — a four-game losing streak that's left the Broncos 2-4 and in need of a quick and drastic turnaround — Keenum doesn't fault Broncos fans for their frustration.

"They should be pissed," Keenum said after the game. "I'm pissed.

"We have to do better. And we keep saying that, but we have to do it. Whatever it is. The plays that we need to make, we need to make them. I see us doing that going forward."

Perhaps the most aggravating detail of this four-game skid is that it doesn't really resemble the eight-game losing streak of 2017. During that stretch, the Broncos lost those eight games by an average of 16.6 points. Against the three playoff teams Denver faced, things were even worse.

Those losses came by a combined margin of 121-58.

That's not how this year's Broncos team has fallen.

In three of their four losses, they've had legitimate chances to win in the fourth quarter — and their two home losses came by a combined seven points against the league's only undefeated teams.

And still, the Broncos are tired of having chances and failing to convert on them.