I am the greatest, able to do least, Yet most suspected, as the time and place Doth make against me, of this direful murder; And here I stand, both to impeach and purge Myself condemned and myself excus’d.
There are no more uses of "purge" in the play.
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The extremists in the party want to purge the leadership of moderates.
Unlike most of his colleagues, he survived the purge of intellectuals during the Chinese Cultural Revolution.