To make something less tight or firm. She loosened the knot in the rope to free the boat.
To relax or become less strict or severe. The company decided to loosen its dress code policy.
To make or become less tense or rigid. He tried to loosen his grip on the steering wheel.
To become less tight or firm. The screw gradually loosened and finally dropped to the floor.
To break up or aerate (soil) so that it is less compact. Before sowing, she loosened the soil with a rake.