standby

Noun
  1. Something that can be relied on when needed (synset 104309057)
    is a type of: thing - an artifact
  2. An actor able to replace a regular performer when required (synset 110756760)
    is a type of: actor, histrion, player, role player, thespian - a theatrical performer
    same as: understudy
Adjective
  1. Ready for emergency use (synset 301860981)
    "a standby generator"; "a standby crew"
    similar to: secondary - being of second rank or importance or value; not direct or immediate

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