Standby | Mean of standby in English Dictionary

/ˈstændˌbaɪ/

• Noun
• a person or thing that is available especially in emergencies
1. More police officers were sent as standbys.
2. We bought an electric generator as a standby.
• ready or available for immediate action or use
1. The police officers were put on standby.
• ready to travel if a ticket becomes available
1. We're on standby for the next flight to Washington, D.C.

• relating to or traveling by an airline service in which the passenger must wait for an available seat
1. standby tickets/passengers