A state of readiness without immediate involvement; remaining in preparation for (a sudden or unforeseen event or situation).
(electronics) sleep mode
(travel) Waiting at the airport in the hope of getting a seat on a flight that is already booked out.
Something that is standard, well-tested, or frequently used.
(proscribed, nonstandard, operations) To wait briefly, as for additional communication by radio or telephone; alternative spelling of stand by