loosen

make loose or looser; "loosen the tension on a rope"

make less severe or strict; "The government relaxed the curfew after most of the rebels were caught"

become less severe or strict; "The rules relaxed after the new director arrived"

disentangle and raise the fibers of; "tease wool"

cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie"

make less dense; "loosen the soil"

become loose or looser or less tight; "The noose loosened"; "the rope relaxed"