Ducking

Alpine
Alpine is a shorthand term to denote that a trick with a set contains a duck or dive (whichever fits most naturally with the trick) in between the uptime and downtime components; the uptime component does not necessarily need to be a set with a dex. If there is an opposite side component between the uptime and downtime components, a duck will fit most naturally (such as Dimwalk or Void). If there is a same side component between the uptime and downtime components, a dive will fit most naturally (such as Tap or Mobius).

Alpine Ripwalk -> Stepping Ducking Butterfly

Alpine Sidewalk -> Stepping Diving Butterfly