Here, Macbeth is belittling Lady Macbeth. This is shown through the words "my dearest chuck, till thou applaud the deed". The term of endearment used here shows that although Macbeth is becoming more evil and inhuman, he still loves Lady Macbeth. Also, this phrase implies that Macbeth doesn't want Lady Macbeth to know about the plan because he is afraid that she might try to stop him. The word "deed" shows that something will be sealed and done, also there is a hint of evil. In conclusion, Macbeth is leaving his wife out of the plan as a power shift from one to the other begins to occur and Macbeth begins to take control.