Also means
failing that
Usage Note
Falls nicht introduces a negative conditional: 'unless this condition holds'. It is commonly appended as a short subordinate phrase and slightly more conversational than es sei denn, dass.
Examples
"Ich komme um drei Uhr, falls nicht etwas dazwischenkommt."
Natural Translation
I'll come at three o'clock, unless something comes up.
Literal Translation
I come at three o'clock, if not something in-between-comes.

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