When you hit a creature with a melee attack on your turn, you can expend one superiority die to attempt to attempt to grapple the target as a bonus action,add the superiority die to your Strength(Athletics) Check.
When you hit a creature with a weapon attack, you can expend one superiority die to attempt to frighten the target. You add the superiority die to the attack's damage roll, and the target must make Wisdom saving throw. On a failed save, it is frightened of you until the end of your next turn.
When you make a weapon attack roll against a creature, you can expend one superiority die to add it to the roll. You can use this maneuver before or after making the attack roll, but before any effects of the attack are applied.
When you hit a creature with a weapon attack, you can expend one superiority die to attempt to knock the target down. You add the superiority die to the attack's damage roll, and if the target is Large or smaller, it must make a Strength saving throw. On a failed save, you knock the target prone.
When a creature misses you with a melee attack, you can use your reaction and expend one superiority die to make melee weapon attack against the creature. If you hit, you add the superiority die to the attack's damage roll.