Wiktionary
take the liberty
vb. (context idiomatic English) To act on one's own authority, without asking for permission.
Usage examples of "take the liberty".
They attack the officers and volunteers, take the liberty of pulling off epaulettes and talk only of cutting and slashing, and declare that they recognize no superior being equals with everybody, and that they will do as they please.
I take the liberty of giving the bearer, Peter Still, a letter to thee.
Nevertheless, I hope I might take the liberty of urging upon you the westward extension of railroads in Texas so that we become more readily able to meet dangers which may arise from that quarter.
And even if he did not, Captain Aubrey, even if he did not, it is no part of my business to take the Liberty, as you put it so wittily.