Final answer:
In the myth of Icarus, the expression "flying too close to the sun" means flying too high and risking failure.
Step-by-step explanation:
The expression "flying too close to the sun" in the context of the myth of Icarus means flying too high and risking failure. In Greek mythology, Icarus and his father, Daedalus, attempted to escape from imprisonment using wings made of feathers and wax. However, Icarus ignored his father's warning and flew too close to the sun, causing the wax to melt and his wings to fall apart, resulting in his downfall.