A body is moving in the direction opposite to the force acting on it. The work done here is:
against the force
The work done by a force on a body is equal to the product of the force applied and the distance moved by the body in the direction of force.
If a body displaces in the direction of force applied on it, then we will say work is done by the force.
If a body displaces in the opposite direction of force that is applied on it, then we will say work done is against the force.
If a body displaces perpendicular to the direction of force applied on it, then we will say work done by the force is 0.