An up throw (上投げ, Up/above/upper throw; commonly abbreviated as u-throw or Uthrow, and referred to as ThrowHi internally) is a throw performed by tilting the control stick up after grabbing an opponent. They were introduced in Super Smash Bros. Melee; in the original Super Smash Bros., there were only forward throws and back throws. In the transition to Melee, Kirby and Jigglypuff's previous forward throws became their up throws, and they instead received new forward throws.
Due to their predominantly vertical knockback and generally moderate ending lag, up throws tend to be useful for starting combos and chain grabs, especially in Melee. Some also deal high enough knockback to KO opponents reliably, with a notable example being Mewtwo's up throw. From Super Smash Bros. Brawl onward, the changes to vertical knockback and the addition of hitstun canceling have indirectly reduced their effectiveness; for a handful of characters, their up throw is their least useful throw, as it can neither start combos as effectively as their down throw (with some of them lacking any guaranteed followups), nor KO as reliably as their forward or back throw. However, some characters' up throws remain an important part of their kit, such as R.O.B.'s, Bowser's in Smash 4, and Diddy Kong's in Smash 4 and Ultimate.
List of up throws
Up throws with hitboxes consist of two or more hits on the grabbed opponent (the hitbox, then the throw), and can affect other opponents near the thrower. Additionally, some up throws may possess a collateral hitbox, which affects nearby opponents but not the victim of the throw.
Notable up throws
Gallery of up throws in Brawl