outsidechance

noun
UK /ˌaʊtˈsaɪd tʃɑːns/
US /ˌaʊtˈsaɪd tʃæns/

A very small chance that something might happen.

There is an outside chance of rain tomorrow, but it will probably stay dry.


OTHER MEANINGS

2. A slight possibility that a team or player could still win.

The underdogs still have an outside chance of making the playoffs.

3. A small hope that something unlikely will come true.

She held on to an outside chance that her lost dog would return.

4. A low-probability opportunity worth considering.

There's an outside chance we could finish the project early if everyone helps.