1. A facial expression: This is the most common meaning. A smile is a facial expression characterized by the upward curving of the corners of the mouth, often accompanied by a widening of the eyes and a relaxation of the facial muscles. It's typically associated with positive emotions like happiness, amusement, and contentment.
2. To express happiness or pleasure: This meaning is closely related to the first definition. We use "smile" to describe the act of expressing happiness or pleasure, often through a smile. For example, "He smiled at her joke" or "She smiled when she saw her friend."
3. To be favorable or agreeable: In some cases, "smile" can be used figuratively to describe something that is favorable or agreeable. For example, "The deal smiled on us" or "The weather smiled upon us."
4. To grin: This meaning is more informal and often implies a wider and more exaggerated smile, sometimes suggesting amusement or even sarcasm.
Ultimately, the specific meaning of "smile" depends on the context in which it's used.