v straighten up or out; make straight
v unfasten, as a sail, from a spar or a stay
v free from flexure
v make less taut
v become less tense, rest, or take one's ease
v release from mental strain, tension, or formality
s incapable of adapting or changing to meet circumstances
a. 不易弯曲的, 坚定的, 不屈的, 冷漠的, 松弛的, 随意的
n. 不拘束, 随意