A switch flips with Nix’s play when the game reaches its do-or-die moments.

ENGLEWOOD, Colo. — It really started back in week 5 at Philadelphia.

The Broncos were down, 17-3 with 2:38 left in the third quarter and quarterback Bo Nix was only 11 of 23 for 72 yards. Then came the reversal.

From there, Nix completed 13 of 16 for 150 yards with a touchdown and a 2-point conversion completion and the Broncos stormed from behind to stun the defending Super Bowl-champion Eagles, 21-17.

Example 1 of Bo Nix in the clutch. Example 2: Bo and the Broncos’ offense are horrid against the lowly New York Jets in London. The Broncos are down, 11-10 with 10 minutes remaining. Nix is just 15 of 24 for 125 yards.

But in leading a 5-minute drive, Nix went 4 of 6 for 49 yards and moved the team within range of a short Wil Lutz field goal for the game-winner.

There is Bo Nix. And there is Bo Nix in the clutch. He can send the social media quarterback experts into a sanctimonious critique when his play goes wrong for good portions of the game. But if the game is close – and even when it’s not – and it comes down to do or die, Nix almost has no peer.

Is performing well when the pressure is on high something that can be learned? Or is it something where you either have it or you don’t?

“A little bit of both,’’ Nix said Wednesday in the front lobby of Broncos headquarters where inclement weather moved the team inside for practice and interviews. “A little bit is the competitive spirit you’re born with but also just the being through several situations. Having to be down to the end of the game, I’ve won some, I’ve lost some and this year we’ve happened to win more than we’ve lost.

“I think it’s something you can build on over time. You learn how to not lose, you learn how to not beat yourself. And you learn how to control the controllables and how to control the jitters when you get down to the end of the game.”

Then there’s the Giants’ game. The Giants game! The Broncos were down, 19-0 with less than 2 minutes remaining in the third quarter. Nix was really struggling, completing a woeful 8 of 22 for 71 yards.

He finished 19 of 28 for 198 yards, two touchdowns, a 2-point conversion completion and scrambles for 21 yards and 18 yards for a touchdown. The Broncos somehow win, 33-32.

Another rally happens against Houston. Nix is only 8 of 20 with 1:19 left in the third quarter as his Broncos are down, 15-7 against the Texans’ No. 1 defense. Suddenly Nix comes alive. He completes 10 of 17 for 94 yards, a touchdown, a 2-point conversion completion and 25-yard scramble to set up another Lutz game-winning field goal. The Broncos win, 18-15.

The Broncos are down 19-16 to the Chiefs with 5 minutes to go. Nix leads the Broncos to two field goal drives for a 22-19 win.

In a 27-26 Sunday win at Washington, Nix has two spectacular drives – the 2-minute drill at the end of the first half when he was 8 of 10 for 64 yards, and in overtime when he was 4 of 4 for 71 yards.

He was OK the other parts of the game, but 12 of 14 for 135 yards during the game’s most pressure-packed moments is the stuff of Broncos lore.

Maybe you can learn how to be poised under pressure because Nix said it’s about experience.

“I would say my first few times in high school when you have to go on the 2-minute drill and you haven’t been comfortable with the 2-minute drill before, you haven’t really done it, you don’t know what you’re doing – that can be a little bit more nerve-wrecking than now when you’ve done it so many times,’’ he said. “I’ve been in both winning situations and losing situations in that final few minutes of a game.

“Now it’s just another drive and you know what they’re going to do and you’ve just got to go out there and find a way to score. It’s a belief that you’ve done it before and you know you’re going to be able to do it again.”