loose

sense 1: grant freedom to; free from confinement
free liberate release unloose unloosen loose

sense 2: turn loose or free from restraint; "let loose mines"; "Loose terrible plagues upon humanity"
unleash let_loose loose

sense 3: make loose or looser; "loosen the tension on a rope"
loosen loose

sense 4: become loose or looser or less tight; "The noose loosened"; "the rope relaxed"
loosen relax loose