comport,
behave behave in a certain manner; "She carried herself well"; "he bore himself with dignity"; "They conducted themselves well during these difficult times"
act,
move behave in a certain manner; show a certain behavior; conduct or comport oneself; "You should act like an adult"; "Don't behave like a fool"; "What makes her do this way?"; "The dog acts ferocious, but he is really afraid of people"
fall from grace revert back to bad behavior after a period of good behavior; "The children fell from grace when they asked for several helpings of dessert"
act up,
carry on make itself felt as a recurring pain; "My arthritis is acting up again"
