What is "unscrews"

Usage examples of "unscrews".

He unscrews the cap and returns to Rocco's table, pouring a large amount of vodka in what is left of one of Rocco's cocktails.

The smell of warm coffee seems to fill the air instantly as soon as Karl unscrews the Thermos stopper.

He continues his strictness, fol­lowing the hawk in its float along the valley within the V of his rifle sight, opening up a bomb and never taking his eyes off what he is searching for as he pulls a Thermos towards him and unscrews the top and drinks, never even looking at the metal cup.