Definition of Idiom
Key Examples in War and Peace
Tolstoy employs an idiom in a scene in which Prince Andrei returns to the home of his father, Prince Nikolai, before heading out to join the war effort against France:
Prince Andrei was looking at a huge gilded frame, new to him, with a picture of the family tree of the princes Bolkonsky [...] Prince Andrei looked at this genealogical tree, shaking his head and chuckling with the air of someone looking at a portrait that is a ridiculously good likeness. “That’s him all over!” he said to Princess Marya, who came up to him. Princess Marya looked at her brother in surprise. She did not understand what made him smile. Everything her father did evoked an awe in her which was not subject to discussion. “Every man has his Achilles’ heel,” Prince Andrei went on.