A state of readiness for immediate action or use.

A person or thing that is ready to take the place of another.

विकल्प

English Usage: He was just a standby in case the main actor couldn't perform.

Hindi Usage: वह बस एक विकल्प था अगर मुख्य अभिनेता प्रदर्शन नहीं कर सका।

To be ready to take action when needed.

To remain in a state of readiness for something.

तत्पर रहना

English Usage: Please standby while we process your request.

Hindi Usage: कृपया तब तक तत्पर रहें जब हम आपकी अनुरोध की प्रक्रिया कर रहे हैं।