#1 loosen v. [loose] make loose or looser; "loosen the tension on a rope". wn
#2 loosen v. [relax] make less severe or strict; "The government relaxed the curfew after most of the rebels were caught". wn
#3 loosen v. [relax] become less severe or strict; "The rules relaxed after the new director arrived". wn
#4 loosen v. [tease, tease apart] disentangle and raise the fibers of; "tease wool". wn
#5 loosen v. [untie, undo] cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie". wn
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