Used chiefly before a noun or noun phrase meaning 'in the absence of' something.
Definitions
In the absence of; if (something) is not available or does not occur. Failing a miracle, the doctors could do nothing more.
Used at the start of a clause: ‘Failing that, …’ meaning ‘if that does not happen’.
Definitions
Used to introduce an alternative if the previous option does not occur or succeed; otherwise. Failing that, we'll reschedule the meeting for next week.