Difficult Terrain
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Difficult Terrain halves the Movement Speed of creatures moving through it, requiring 
2 m / 7 ft of movement to move 1 m / 3 ft through this type of area.
Examples of difficult terrain include:
Twisting Vines, 
Web, 
Spikes, 
Mud, 
Grease, 
Ice, 
Lava, 
Deep Water and many other types of Surfaces.- Non-surface areas created by spells such as
Hunger of Hadar. - The overgrowth created by
Plant Growth uniquely quarters movement speed.
The extra expenditure for movement also applies to 
Jumping. Furthermore, Weapon actions which require expending movement do not function while the character is affected by Difficult Terrain. These include 
Brace (Ranged), 
Brace (Melee), and 
Prepare.