Dreams about someone else eating glass may symbolize your concern or worry about that person’s well-being. Eating glass in dreams generally represents dangerous or harmful behavior, so this dream may be a reflection of your anxiety about someone you care about engaging in risky or harmful activities.
Alternatively, this dream may also represent your feelings of powerlessness or helplessness in a situation involving that person. You may feel like you cannot do anything to prevent them from engaging in dangerous behavior, and this dream is a manifestation of those feelings.
It is important to consider the specific details and emotions of the dream to better understand its meaning. Talking to the person you dreamed about or seeking the help of a therapist may also provide further insight and guidance.