"from their color fly"
Imagery
Act 1,
Scene 2
Lines 119-131
Cassius
In Cassius' disdainful description of a very sick Caesar, you would expect him to say that the color had left Caesar's lips, which is a common symptom of illness. But Shakespeare has cleverly reversed the subject and object of the phrase in order to create another image entirely. Caesar's lips are like cowardly soldiers fleeing from their colors—the battle flag around which the soldiers should rally. The imagery conveys both Caesar's illness, and—more importantly—his lack of fortitude.