Your character has trained to grapple using old school, no holds barred catch wrestling (Olympic style wrestlers learn the first two maneuvers), Brazilian Jiu-Jitsu or Russian sombo. He uses leverage and positioning to out-grapple opponents.

Sprawl (•): Your character knows how to “sprawl” and sink his weight to avoid being overpowered in a grapple. Subtract the higher of Strength +1 or Dexterity +1 from dice pools to overpower him in a grapple. This doesn’t apply to the initial hold, but subsequent attacks from the grip.

Takedown/Throw (••): Your character knows how to rapidly close with your enemy and take him to the ground. In lieu of securing a grappling hold, he can immediately render the opponent prone (see The World of Darkness, p. 157 and 164). Furthermore, if he takes an opponent down this way, he can choose whether or not to go prone with the target. Mixed martial arts fighters take a crouching (but still standing) position from her and deliver vicious beatings with their hands – a technique called “ground and pound.”

Chokehold (•••): Your character can efficiently choke enemies by cutting off blood flow to their brains. If he overpowers an opponent in a grapple, he can start the choke. The choke inflicts a cumulative –1 die penalty to the opponent’s actions for each turn it’s maintained. The victim falls unconscious if he endures a choking attack for a number of consecutive turns equal to his Stamina. Your character can continue choking an unconscious victim. This inflicts lethal damage equal to the attacker’s Strength + Brawl successes every turn.
Chokeholds don’t work on opponents who don’t need to breathe.

Submission Hold (••••): Opponents caught in your joint locks can’t escape without injuring themselves. If your character scores more successes than his opponent’s Size in an immobilization attempt, the victim can’t attempt any physical action – including breaking free – without suffering a point of lethal damage. This penalty lasts from the moment of immobilization to end of the next turn.
Furthermore, your character can always choose to inflict one point of lethal damage whenever he damages an opponent with an overpowering roll. The character’s first Strength + Brawl success inflicts a point of lethal damage; subsequent successes inflict bashing damage.
Submission holds don’t work on creatures that don’t have bones.

Schools: As the core description mentions, the most common versions of this style are used by Brazilian Jiu-Jitsu stylists and mixed martial artists. Olympic style wrestlers don’t learn the listed higher dots, but might have specialized maneuvers to replace them. Some pro-wrestling schools teach real catch as catch can wrestling along with ring showmanship. In the wrestling world, “legit” grapplers enjoy a certain amount of prestige – and bring the real pain to anyone to tries to mess with them.

Remember that specific styles may have specialized maneuvers (see p. 106).