standby
UK: ˈstændbaɪ | US: ˈstændbaɪ
n. a state of readiness or temporary support
n. a substitute or backup option
vi. to remain ready or available
The word "standby" combines "stand" (from Old English standan, meaning "to remain upright") and "by" (from Old English bī, meaning "near" or "alongside"). Originally used in nautical contexts to describe ships or crew ready for action, it evolved into a broader term for readiness or backup support. The logic reflects physical proximity ("standing by") transitioning to metaphorical availability.
The emergency generator is on standby in case of a power outage.
She was asked to standby while the team finalized the decision.
This flight has no standby seats available.
The actor served as a standby for the lead role during rehearsals.
Keep your phone on standby for updates.