secondoption

noun
UK /ˌsekənd ˈɒpʃən/
US /ˌsekənd ˈɑːpʃən/

A second option is another choice you can pick if the first one does not work.

If the bus is full, the train is our second option.


OTHER MEANINGS

2. A less preferred person or thing that is chosen when the first is unavailable.

The team signed a second option at goalkeeper after the starter got injured.

3. In business, a secondary product or service offered alongside the main one.

The airline added a second option for passengers who want extra legroom.

4. A backup plan kept ready in case the main plan fails.

We kept a second option in mind in case the outdoor event got rained out.