@GunnerMcGrathDash can or cannot be taken twice in a turn, once as an action and once as a bonus action (for rogues and monks)? A rogue using Cunning Action and a monk using Step of the Wind can use Dash twice on a turn (action + bonus action).
— Jeremy Crawford (@JeremyECrawford) February 10, 2015
Rogue Cunning Action is described in Player’s Handbook p.96
Monk Step of the Wind isin PHB p.78
Bonus Action PHB p.189
Dash PHB p.192