Only look up clear/To alter favour ever is to fear (1.5.81-2)
i.e., Ensure you maintain a guiltless ('clear') expression because fear might show in your face.
For more on this passage please see the annotations at the bottom of the main page of Macbeth 1.5
How to cite this article:
Mabillard, Amanda. Macbeth Glossary. Shakespeare Online. 20 Aug. 2000. (date when you accessed the information) < http://www.shakespeare-online.com/plays/macbeth/macbethglossary/macbeth1_1/macbethglos_clear.html >.