1. a container, typically made of metal or plastic, used to carry a packed lunch to school or work
Usage: common in American English; often used by children

Examples

• She packed her sandwich and apple in her lunchbox before school.
• The vintage metal lunchbox featured cartoon characters on its sides.
• He forgot his lunchbox on the bus and had to buy lunch at the cafeteria.
• My daughter's lunchbox keeps her food cold with an ice pack.
• The teacher reminded students to bring their lunchboxes on the field trip.
• Colorful lunchboxes lined the shelves of the back-to-school store.