Take The Liberty Meaning

(idiomatic) To act on one's own authority, without asking for permission.

Example:   I took the liberty of adding your name to the list.
1922, James Joyce, Ulysses Episode 12, The Cyclops
  â€”What about Dignam? says Bob Doran. Who's talking about ...?
  â€”Dead! says Alf. He's no more dead than you are.
  â€”Maybe so, says Joe. They took the liberty of burying him this morning anyhow.