1. comparative form of chummy; more friendly or intimate in a casual way
Usage: informal

Examples

• The two coworkers became chummier after working on the project together.
• She seemed chummier with the new students than with her old friends.
• The atmosphere at the office grew chummier during the holiday party.
• He was getting chummier with his neighbor over their shared love of gardening.
• The teammates were much chummier this season compared to last year.
• After a few drinks, everyone became chummier at the reunion.