At liberty 自由，随意
The Statue of Liberty sits on an Island in New York. It is 93 metres from ground to torch and weighs about 225 tons. There are seven rays on her crown, one for each of the seven continents.
To be at liberty to do something 表示一个人可以自由地、随意地、不受约束地做某事。
Some companies keep information about salaries confidential, and lower-rank managers are not at liberty to discuss them.
This is a free country! I'm at liberty to go wherever I like.
另一个短语 to take liberties with something 或 someone 的意思是滥用做事的权力，冒昧行事。
Don't take liberties with me, Mr Jones! I am a married woman and the only man allowed to kiss me is my husband.