Minor Action

As the name implies, minor actions are simple and quick.

Draw or sheathe a weaponUse or put away a weapon
Drink a potionConsume a potion
Drop proneDrop down to lie on the ground
Load a crossbowLoad a bolt into a crossbow to fire it
Open or close a doorOpen or close a door or container that isn't locked or stuck
Pick up an itemPick up an object in one's space or in an unoccupied square within reach
Retrieve or stow itemRetrieve or stow an item on self

Published in Player's Handbook, page(s) 267, Rules Compendium, page(s) 194.