Real Dictionary

drag
verb: If you drag something, you pull it along the ground, often with difficulty.
verb: To drag a computer image means to use the mouse to move the position of the image on the screen, or to change its size or shape.

drag in American English
intransitive verb: to be drawn or hauled along
transitive verb: to draw with force, effort, or difficulty; pull heavily or slowly along; haul; trail

drag in Automotive Engineering
noun: Drag is used to describe the forces in the air that push against the movement of a vehicle.

drag in British English
verb: to pull or be pulled with force, esp along the ground or other surface

drag in Chemical Engineering
noun: Drag is the force which a fluid exerts on an object because of their relative movement.

drag in Mechanical Engineering
noun: Drag is the force that a fluid exerts on an object caused by a difference in velocity between the fluid and the object.