翼

1. Origins, structure, and basic meaning

• Structure: 翼 (つばさ) is a wing of a bird or flying object. It appears as a living organ and as a repairable model-aircraft part.
• Basic usage: A white bird spreads its wings to take off; one wing of a model airplane is repaired.

2. Common pitfalls and similar expressions

• Living flight organ and repairable aircraft component
  • The wing in 翼を広げる belongs to a bird, whereas 片方の翼 is a structure on a model. The latter does not imply actual flight capability.