Terrion Arnold’s offseason is off to a dangerous start.

The Lions’ star cornerback posted Thursday a security video of him slipping on his carpet and falling down a flight of stairs.

The footage shows Arnold looking at his phone before his right leg gives way and he begins sliding down at least a dozen stairs.

“Had a rough morning,” Arnold posted on his X account, followed by laughing emojis.

Arnold attempted to break his fall by grabbing the railing with his left arm, but that didn’t stop his momentum as he ended up at the bottom of the flight of stairs.

Arnold hit the top stair with his right heel instead of the ball of his foot as his phone appears to be the root cause of what could have been a terrible accident.

His lower back hit the ground first as he slid down the stairsm but he appears to have avoided a serious injury — although if the Lions had not been upset by the Commanders, he might have made an appearance on the injury report.

Arnold was a first-round pick in the 2024 NFL Draft and was among the best rookies in the NFL this year on one of the league’s best defenses when fully healthy.

The Lions dealt with a rash of injuries that eventually ended their season but Arnold was a stabilizing piece for the unit led by defensive coordinator Aaron Glenn.

Glenn has since departed the Lions to be the Jets head coach.

“Couldn’t be happier for you coach thanks for everything u taught me in year 1,” Arnold posted on X when the news dropped that Glenn would not be back with the team.

Arnold had 10 pᴀsses defended and 60 tackles and consistently matched up with one of the opponent’s top receiving threats.