Blind bake means to bake a pie crust without a filling. There are several techniques used to ensure that the pie crust holds it shape when baked empty. Pie weights can be placed in the shell to keep it from puffing. The shell can be lined with foil and dried beans or peas. Pricking the crust with a fork before baking also helps the crust keep its shape. 

To bake a pie crust without the filling. Metal weights or dried beans are commonly used to weigh the crust down to prevent it from bubbling

Blind bake is also known as Baking blind

Blind baking refers to a method of preparing a pastry case before adding the filling, in order to prevent the bottom becoming soggy and undercooked. The pastry is first baked with a lining weighted with beans.