-seal off (a place) to prevent people from coming in or out

Block (the base of blockade)

Definition: make the movement or flow in difficult or impossible

-Ade (suffix of blockade)

Definition: action

Below is a picture of a blockade

Big image
The word block means to keep out or in. When you add -ade (action) to it, it becomes blockade. Putting these two together turns block into an action, blockade.

Example sentence

The blockade is preventing all trade to and from the port.