In "The Tragedy of Macbeth", by William Shakespeare, Act V, Scene I, what Lady Macbeth means by "when none can call our pow'r to accompt" is that no one can say they are guilty. It is Lady Macbeth who makes plans to kill King Duncan, it is Lady Macbeth who wants to be a man to do it, it is Lady Macbeth who calms her husband when he has done it. And it is Lady Macbeth who feels terribly guilty by the murder of King Duncan. She sees an unexistent blood stain, and so she says that no one can call them guilty because no one has seen them do it.
