unstick
v. 扯开；分开
过去式：unstuck 过去分词：unstuck 现在分词：unsticking 第三人称单数：unsticks
近义词：loosen，release，pry，free，takeoff，takedown，takeapart，prise，prize，
例句
- The (flap of the) envelope was unstuck.信封(的封口)没粘住。
- His plan to escape came badly unstuck.他想逃走的打算完全吹了。