Noun

1. The act of caressing with the lips (or an instance thereof)
2. A vehicle carrying many passengers; used for public transport
3. The topology of a network whose components are connected by a busbar
4. An electrical conductor that makes a common connection between several circuits
5. A car that is old and unreliable

Verb

1. Touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.
2. Send or move around by bus
3. Ride in a bus
4. Remove used dishes from the table in restaurants