Слово "undo". Англо-русский словарь Мюллера

The surviving remnants on the once-great world undid further what had been left and, in a generation, Trantor was transformed from the greatest planet the human race had ever seen to an inconceivable tangle of ruins.

I undid the clasp of the gold chain and put it around my neck and clasped it.

He undid the top hooks on his greatcoat and pulled the card from the pocket of the army shirt that showed underneath. It actually had been issued that morning in the out-patients' department.

Most of the time they screamed abuse at him and threatened at every hesitation to deliver him over to the guards again; but sometimes they would suddenly change their tune, call him comrade, appeal to him in the name of Ingsoc and Big Brother, and ask him sorrowfully whether even now he had not enough loyalty to the Party left to make him wish to undo the evil he had done.

To the future or to the past, to a time when thought is free, when men are different from one another and do not live alone--to a time when truth exists and what is done cannot be undone: From the age of uniformity, from the age of solitude, from the age of Big Brother, from the age of doublethink--greetings!

we can undo and unfriend