a. Green with envy - To be extremely jealous. Example: "When she saw his new car, she turned green with envy." b. Black sheep - An outcast or someone who is different from the rest of the family or group. Example: "He's the black sheep of the family; everyone else is successful." c. Red flag - A warning sign or signal of potential danger or problem. Example: "His aggressive behavior is a red flag; we need to be cautious." d. Golden opportunity - A chance or opportunity that is highly advantageous. Example: "She saw the job opening as a golden opportunity to advance her career." e. Paint the town red - To go out and enjoy oneself, usually by partying or celebrating. Example: "It's my birthday; let's paint the town red tonight!"