Final answer:
The idiom 'double life' typically refers to someone living two separate and secret lives simultaneously.
Step-by-step explanation:
The idiom 'double life' typically refers to someone living two separate and secret lives simultaneously. This is option A) - choice A) is the correct answer. When someone leads a double life, they are deceiving others by presenting different identities or engaging in contradictory behaviors in different contexts. A famous example of leading a double life is the character Dr. Jekyll in Robert Louis Stevenson's novel 'The Strange Case of Dr. Jekyll and Mr. Hyde.' In the story, Dr. Jekyll lives a respectable life during the day but transforms into the evil Mr. Hyde at night.
This metaphorical use of 'double life' emphasizes the concept of living with hidden or conflicting aspects of one's identity.