The term 'priority' is often informally used to describe a move's general ability to beat other moves, due to factors such as its damage output, hitbox position, attack speed, non-vulnerable hurtboxes, or other properties. In addition, an attack that clanks is still dangerous to bystanders until rebound begins, even if it was entirely outprioritized by the opposing attack. For example, if one hitbox clanks with an enemy attack, the entire move clanks, regardless of how many other hitboxes would not have clanked. While the effects of priority are calculated based on individual hitboxes, the results are applied to the attacker as a whole.

Certain hitboxes are also marked as being 'cannot clank' or 'cannot rebound', affecting their ability to cancel out (and be cancelled out by) opposing moves. The most common exception is aerial attacks, which usually can clank with projectiles, but not with ground attacks or other aerials, and cannot rebound at all. If one attack is much stronger than the other, it wins outright, and more often than not will continue on to strike the enemy stuck rebounding. If the attacks are roughly equal in strength - the difference in damage is 9% or less - then both characters rebound from the impact and pause for a moment before they can do anything else. Most commonly, when the hitboxes of two characters' attacks collide with each other, they clank, freezing both in place for a moment.

Priority is the system that governs how opposing attacks interact with each other in the Super Smash Bros. The white 'bubble' between Kirby and Pikachu's attacks indicates that two hitboxes have collided.

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