Muzzle Rise
Also: Muzzle Flip
The upward pivot of the muzzle under recoil as the rifle rotates about the shoulder, lifting the sight off target between shots.
When a rifle recoils, the push lands at the shoulder while the bore sits above it, so the rifle rotates and the muzzle climbs. That muzzle rise lifts your sight off the target and is the main reason you lose sight of your own impact during a shot.
Controlling it is what makes spotting your hits possible. A muzzle brake that vents gas upward, a stock that puts the bore more in line with the shoulder, and steady recoil management all flatten the rifle so it tracks straight back. Staying behind a flat-tracking rifle through follow-through lets you watch the bullet land and call your own correction.