standby
This term conveys a state of readiness and anticipation, often associated with a secondary or backup role. When used as a noun, it refers to the person or object acting as the safety net, while the adjective form describes the state of being poised for action. In aviation, it specifically denotes a precarious status where travel is not guaranteed but depends on remaining capacity.
In technical contexts, particularly electronics, it describes a specific power state. This is distinct from being completely off or fully active, representing a dormant but responsive mode. Users should distinguish between "on standby" (the state of readiness) and "a standby" (the person or thing providing that readiness).
Meanings
A person or thing kept available for use if needed, especially as a substitute for someone else.
We have a standby goalkeeper in case the starter is injured.
A passenger who waits for an available seat on a flight after all tickets have been sold.
The airline has a long list of standby passengers for the flight to London.
A piece of equipment or a system that is ready to operate immediately if the primary system fails.
The hospital maintains a standby generator to ensure power during outages.