Expeditious Retreat

Level & School
1st-level transmutation
Casting Time
Bonus action
Range
Self
Components
V, S
Duration
Concentration, up to 10 minutes
Classes
Sorcerer, Warlock, Wizard

You take the Dash action, and until the spell ends, you can take that action again as a Bonus Action.

Level & School
1st-level transmutation
Casting Time
Bonus action
Range
Self
Components
V, S
Duration
Concentration, 10 minutes
Classes
Sorcerer, Warlock, Wizard

This spell allows you to move at an incredible pace. When you cast this spell, and then as a bonus action on each of your turns until the spell ends, you can take the Dash action.

Expeditious Retreat 5.5e 2024 vs. 5e 2014 edition differences

The 2014 version allows taking the Dash action as a bonus action each turn, while the 2024 version lets you take the Dash action as your action and then again as a bonus action each turn until the spell ends. The 2024 version explicitly states the repeated Dash action, whereas the 2014 version implies it.