1. loosen up : 信口开河, 慷慨解囊, 松弛下来, 活动肌肉, 做准备动作；
及物动词
不及物动词
1. 放宽，放松（限制、法律等）
If someone loosens restrictions or laws, for example, they make them less strict or severe.
1. become loose or looser or less tight
e.g. The noose loosened
the rope relaxed
2. make loose or looser
e.g. loosen the tension on a rope
Synonym: loose
3. make less dense
e.g. loosen the soil
4. cause to become loose
e.g. undo the shoelace
untie the knot
loosen the necktie
5. disentangle and raise the fibers of
e.g. tease wool
Synonym: teasetease apart
6. become less severe or strict
e.g. The rules relaxed after the new director arrived
Synonym: relax
7. make less severe or strict
e.g. The government relaxed the curfew after most of the rebels were caught
Synonym: relax